MOSS/Foundational Technology/Projects We Use

This is an incomplete list of the free software and open source projects Mozilla relies upon. As a starting point, it lists each project along with a short statement of how we depend on it. Where practical it would also be helpful to identify a Mozillian most closely associated with our use of each project.

Note that presence on this list isn't the same as, nor is it a prerequisite for, applying for the MOSS "Foundational Technology" track - projects have to make an application using the process on the Foundational Technology page.

This is a work in progress - please contribute to this list. Note that it's in alphabetical order.

Project	Description and Use	Contact within Mozilla
Adjust	Mobile app analytics; used to track installs on Firefox for Android & other products	Android & iOS teams
Airflow	Airflow is a platform to programmatically author, schedule and monitor workflows.	Roberto Agostino Vitillo
American Fuzzy Lop	A security-oriented fuzzer.	Unknown
ANGLE	A conformant OpenGL ES implementation for Windows, Mac and Linux	Platform Graphics Team
angular.js	Used by A-Team for web apps (eg Treeherder)	Member of Jonathan Griffin's team
Apache Server	Used by A-Team for web apps	Member of Jonathan Griffin's team
Ansible	Used by IT (netops) and A-Team to manage deployments	jbarnell , Webops, GPS?
AreWeFastYet	Compare JS performance across JS engines and platforms	Hannes Verschore
Argon	Used as the foundation for mobile AR web browser research by Emerging Tech	Blair MacIntyre
Atom	Used (either vanilla or e.g. as [1] ) by various developers
BabelJS	JavaScript compiler, Used by Gaia, TaskCluster team	Selena Deckelmann
BIND	DNS Server	Brian Hourigan
Bleach	HTML sanitizing library that escapes or strips markup and attributes used by MDN and a bunch of Mozilla sites	Will Kahn-Greene
Blessings	Terminal formatting lib used by mozilla-central build process	Erik Rose
Blink Web Audio	Web audio implementation from Blink
Bootstrap	HTML/CSS/JS framework, used by many of Mozilla's sites.	Webdev
bro	The Bro Network Security Monitor	Michal Purzynski
brotli	Compression library
Browserify	Build JS dependencies for the browser	mozilla-services (kinto.js)
BuildBot	The base system currently in use for release	Dustin J. Mitchell
Bugzilla (upstream)	The base Bugzilla on that we customize for Mozilla's use	Mark Côté
Cairo	Vector graphics-based, device independent API; includes pixman	Jeff Muizelaar
ccache	A compiler cache; used by Servo and Gecko builds	Ted Mielczarek
Celery	Distributed task queue. Used by Treeherder and others.	Member of Jonathan Griffin's team
certlint	Certificate checking tool, used by the Root Store team	Kathleen Wilson
cffi	C Foreign Function Interface for Python.	Cloud Services Team
CKEditor	WYSIWYG editor on MDN
CLDR	Common Locale Data Repository - Unicode data
CMake	cross-platform family of tools designed to build, test and package software, lua_sandbox, lua_sandbox_extensions, hindsight, hindsight_admin	Mike Trinkala
Chai	JavaScript test and assertion library	Cloud Services, Tarek Ziade's team (kinto.js), Firefox Hello team
Chromium Embedded Framework	A simple framework for embedding browsers in other applications	Jack Moffitt
Clang/LLVM	C/C++ compiler and infrastructure	Ehsan Akhgari & Sylvestre Ledru
CodeMirror	Used in DevTools, Thimble, and other online code tools	David Humphrey/Simon Wex
Cookiecutter	Templating system used to clone our Sugardough Django template	Giorgos Logiotatidis
Compiler Explorer - C++	Online C++ compiler with assembly output. Used by devs to test&optimize code snippets.	Unknown
Compiler Explorer - Rust	Online Rust compiler with assembly output. Used by devs to test&optimize code snippets.	Unknown
ConEmu	Console emulator for Windows. Used by devs running Windows.	Ed Morley
ConfigArgParse	A drop-in replacement for argparse that allows options to also be set via config files and/or environment variables	Cloud Services Team
crt.sh	Global certificate corpus search website	Gervase Markham
cubeb	Cross-platform audio library
curl	internet transfer tool and library, used by crashreporter and FirefoxOS	Daniel Stenberg
Debian	Used on many developer boxes	Sylvestre Ledru or glandium
Deis	Open Source Heroku-like PaaS platform. Hosts www.mozilla.org, masterfirefoxos.mozilla.org, etc.	Member of Benjamin Sternthal's team
Disconnect.me	Open, transparent, neutral Tracking Protection blocklist used in Firefox Private Browsing Windows	Marshall Erwin, Javaun Moradi, Francois Marier
Discourse	Community, Webmaker, Advocacy, et al	Community Ops (Yousef Alam or Tanner Filip)
Django	Backend web framework used on many of our websites, including addons.mozilla.org, marketplace.mozilla.org, support.mozilla.org, Input, Snippets, MDN (Mozilla Developer Network), mozilla.org, nucleus, Treeherder	Andy McKay and Jannis Leidel are (or have been) on the Django Software Foundation board, Jannis is core team member
Django REST framework	API framework. Used by various Mozilla sites including MDN, Firefox marketplace, mozilla.org, support.mozilla.com.	Andy McKay and Jannis Leidel
Docker	Used by release engineering for Linux build and test containers and by ateam for managing test and production services. Used by many Mozilla websites as well such as addons.mozilla.org, marketplace.mozilla.org. (Plus docker-compose and docker machine)	Member of Selena Deckelmann's team
double-conversion	Efficient binary-decimal and decimal-binary conversion routines for IEEE doubles
Doxygen	tool for generating documentation from annotated sources, lua_sandbox	Mike Trinkala
Drupal	Open Source CMS. Used by Dev Rel team.	Potch
ecdsa	ECDSA cryptographic signature library (pure python)	Cloud Services Team
Eclipse	Integrated Development Environment used by many developers	—
editline	Line editing library (from libedit)
elasticsearch	Search engine for various web sites and analytics	Erik Rose (dxr), Kyle Lahnakoski (ActiveData), Jason Thomas
Elm	A delightful language for reliable webapps.	Rok Garbas (garbas), Release Engineering Team
emacs	Programmable editor used by many developers	—
EmojiOne	Upstream Emoji artwork used in the Firefox built-in Emoji font	Tim Chien (See emojione-colr)
eslint	Pluggable linting utiltity used by Firefox Hello, DevTools and Firefox Android	Mark Banner, Nicolas Perriault
Etherpad	Used for meeting notes, etc	JP Schneider
fdlibm	???
ffmpeg	Used for media decoding.	Jean-Yves Avenard
flake8	Wrapper around Python linters. Used by Treeherder and others.	Member of Jonathan Griffin's team
Flask	Python web framework	Erik Rose
Flow	A static type checker for JavaScript	Greg Tatum, Jason Laster, Nicolas Perriault
Font Awesome	Font and CSS toolkit, used by many of Mozilla's sites.	Webdev
FontForge	Built-in Emoji font compilation	Tim Chien (See emojione-colr)
FontTools	Built-in Emoji font compilation	Tim Chien (See emojione-colr)
Foundation Framework	Responsive front-end framework, used by some Mozilla sites and add-ons	Luke Crouch
FreeType	Small, efficient, highly customizable, and portable library for producing high-quality output (glyph images) of most vector and bitmap font formats.	Platform team
GCC	C/C++ compiler and infrastructure	Nathan Froyd
GDB	The GNU Debugger, the sole debugger for Linux	Jim Blandy
Git	Version control system - https://git.mozilla.org	Unknown
Glitz	OpenGL image compositing library
Gradle	Build automation system; used to build Firefox for Android	Android team
Graphite	Graphite is a "smart font" system developed specifically to handle the complexities of lesser-known languages of the world.	Platform team
gunicorn	Python WSGI HTTP Server. Used by Treeherder, Socorro, Pontoon.	Webdev
Hive	The Apache Hive data warehouse software facilitates reading, writing, and managing large datasets residing in distributed storage using SQL.	Roberto Agostino Vitillo
HarfBuzz	International text shaping engine used in Firefox/Servo	Platform team
HBase	HBase is an open-source, distributed, versioned, column-oriented store modeled after Bigtable.	Roberto Agostino Vitillo
brew / Homebrew	Mac OS X packaging system, used to install dev tools	Sam Penrose
Homu	A bot that integrates with your favorite continuous integration service; used by Rust and Servo	Jack Moffitt
Hunspell	Spellchecking engine	Ehsan Akhgari
Hyphen	Hyphenation library	Jonathan Kew
HTTPie	HTTP command-line client	Cloud Services (among many others), Tarek Ziade's team
hyper	Hyper is a set of related projects that provide HTTP/2 functionality to Python projects.	Cloud Services Team
Hyper	A fast, modern HTTP implementation written in and for Rust; used by Servo	Sean McArthur
Icecream (icecc)	Distributed build system, used to speed up local Firefox build times in some Mozilla offices	Daniel Holbert, or contributors on the Icecream MDN Page
ICU	(And ICU4J) International Components for Unicode - internationalization library
ideone.com	Online compiler & runner for a number of languages. Used by devs to test&benchmark code snippets.	Unknown
inspircd	Irc server used by mozilla	:ashish
Intern	Intern is a complete test system for JavaScript designed to help you write and run consistent, high-quality test cases for your JavaScript libraries and applications.	jrgm/vladikoff
jemalloc	Memory allocation library	We can ask glandium
Jenkins CI	Continuous integration system used by WebQA and EE	Unknown
jQuery	JavaScript library, used by many of Mozilla's sites.	Webdev
jsdom	DOM implementation in full JS	Test suites in Cloud Services, Tarek Ziade's team (kinto.js)
jsoncpp	A C++ library for interacting with JSON, used by the crashreporter client and Socorro.	Gabriele Svelto
jsPsych	A JavaScript library for creating and running behavioral experiments in a web browser.	Josh Gaunt
Jupyter Notebook	The Jupyter notebook is a web-based notebook environment for interactive computing.	Roberto Agostino Vitillo
Kafka	Distributed transaction log, used for hg.mozilla.org replication.	gps
kissfft	FFT library, presumably
Knowledge Repo	The Knowledge Repository project is focused on facilitating the sharing of knowledge between data scientists and other technical roles using data formats and tools that make sense in these professions.	Roberto Agostino Vitillo
Kombu	Messaging library for Python. Used by Treeherder and others.	Member of Jonathan Griffin's team
LaTeX	A document preparation system.	Alan Jeffrey (ajeffrey)
Leak Canary	Android memory leak detection framework	Android team
libav	Audio and video libraries
libbz2	Compression library for .bz2 format	Julian Seward
libevent	Provides a mechanism to execute a callback function when a specific event occurs on a file descriptor or after a timeout has been reached.	Platform team
libffi	A Portable Foreign Function Interface Library.	Platform team
libjpeg-turbo	JPEG decoding library	Jeff Muizelaar
libnestegg	WebM demuxer
libpng	PNG decoding library	Jeff Muizelaar
libvpx (Google)	Library for support of Google’s VP* family of codecs; includes libmkv	Tim Terriberry
libyuv	Colourspace conversion
LLVM	Compiler foundation for ASAN, static analysis tools, Rust	Unknown
lodash	JavaScript utility library, used by many of Mozilla's sites.	Webdev & Firefox Hello
Lua	Lua is a powerful, efficient, lightweight, embeddable scripting language, lua_sandbox_extensions	Mike Trinkala
MacVim	Mac wrapper around Vim	-
Mailman	Mailing lists	Unknown
marshmallow	A lightweight library for converting complex datatypes to and from native Python datatypes.	Cloud Services Team
MediaWiki	You are reading this on a wiki	Shyam Mani
Mercurial	Version control system and source code management	GPS
Mesa	3D graphics library used by Servo & Gecko	Unknown
Meteor	Build Apps with Javascript - Used in MozDef's Web UI	MozDef Team in EIS
Mocha	JavaScript test runner	Cloud Services, Tarek Ziade's team (kinto.js); Firefox Hello team
Mohawk	Python library for Hawk HTTP authorization. Used by Treeherder and others.	Member of Jonathan Griffin's team
mozdef	Security event monitoring and incident response	Jeff Bryner
msys	Used to build Firefox on Windows. Note: It's likely best we support the newer MSYS2 project instead: https://github.com/msys2	Unknown
MySQL	Open source relational DB used by many developers, including AMO, SUMO, Input, bugzilla, releng, adminstered by IT	Matt Pressman
Nagios	IT management system. Used for notifications of system failures	Linda Ypulong
netsniff-ng	Linux networking toolkit	Michal Purzynski
neovim (nvim)	Next-generation vim code editor	Ralph Giles
Ninja	A small build system with a focus on speed - used by Servo dependencies.	Jack Moffitt
Nix	Reproducible build tool.	Rok Garbas (garbas), Release Engineering Team
NixOS	Reproducible Linux distribution. Used by some developers	Nicolas B. Pierron
nginx	Web Server. Used by almost everything CloudOps runs.	Travis Blow
Node.js	JavaScript runtime for server side applications, command line utilities	Nick Desaulniers
nrappkit	Toolkit for building standalone applications	Unknown
NSIS	Windows installer framework	Matt Howell
NSS	Network Security Services	jcjones?
Octave	Numerical analysis/mathematics software.	Jean-Marc Valin
OpenH264 (Cisco)	H.264 video library	Unknown
OpenLDAP	User management used by Infra	:jabba?
OpenResty	a fast web app server by extending nginx, used by cloudops	Benson Wong (mostlygeek)
OpenSSH	Remote server management, secure transport for Git and Mercurial	Unknown
OpenSSL	Cryptograpahy and TLS Toolkit	Nick Desaulniers
OpenStreetMap	Online/offline maps, used by the location service and on mozilla.org	Unknown
Openvpn	VPN used by Infra	:jabba?
OpenVR	VR hardware support library
OTS	OpenType sanitizer used by Firefox to protect against security bugs in underlying platforms related to malicious fonts	Jonathan Kew
OWASP ZAP	Web security testing tool used by security and QA teams	Simon Bennetts (psiinon)
Owncloud	Open platform to host your cloud under your control	Some communities have been using it to host files under their control (ask Nukeador)
Pandoc	universal document converter, lua_sandbox_extensions	Mike Trinkala
Parquet-MR	Parquet-MR contains the java implementation of the Parquet format	Roberto Agostino Vitillo
parquet-cpp	C++ library to read and write the Apache Parquet columnar data format, lua_sandbox_extensions	Mike Trinkala
Parsimonious	Parsing lib used by DXR and a few other sites (I think)	Erik Rose
PDF.js	Used as the PDF Viewer in Firefox and Firefox OS	Brendan Dahl, Yury Delendik
PDFium	PDF viewing and printing in Firefox	Peter Van Der Beken, Evelyn Hung
pep8	Python linter. Used by Treeherder and others.	Member of Jonathan Griffin's team
Perl	Used by Bugzilla	Member of Jonathan Griffin's team
Picasso	Android image fetching framework	Android team
pillow	Python Imaging library	Member of Webcompat team
pip	Python package tool. Used by all Python projects.	Erik Rose and Jannis Leidel, Jannis is core team member (PyPA)
Piwik	Analytic software that gives you the control and respects privacy	Some communities have been using it to avoid GA analytics (Ask Nukeador)
Pocketsphinx	Speech recognition toolkit embedded into Firefox OS	André Natal
PostgreSQL	Open source relational DB used by many developers, adminstered by IT	Selena Deckelmann
Presto	Distributed SQL query engine for big data.	Roberto Agostino Vitillo
Prism.js	Syntax highlighting on code samples on MDN
ProGuard	Java bytecode optimizer; optimizes Firefox for Android	Android team
Puppet	System administration tool	Member of Amy Rich's team, Corey Shield's team
PyCharm	Python IDE	Jonathan Griffin
pyflakes	Python linter. Used by Treeherder and others.	Member of Jonathan Griffin's team
PyPy	Python language runtime. Used by Web Push service.	Cloud Services, esp. Ben Bangert
Pyramid	Python Web framework	Cloud Services Team
pytest	Python testing tool. Used by Treeherder and others.	Dave Hunt
Python	Scripting language	Python Software Foundation, Selena Deckelmann is a former board member
python cryptography	cryptography is a package which provides cryptographic recipes and primitives to Python developers.	Cloud Services Team
pyelasticsearch	Python client for elasticsearch	Erik Rose
python-jose	a JavaScript Object Signing and Encryption (JOSE) implementation in python	Cloud Services Team
qcms	Mozilla fork of lcms
RabbitMQ	Distributed Queue, used by Socorro, Pulse (all our publicly available build/test/commit information flows through this), Treeherder, addons.mozilla.org (with Celery), marketplace.mozilla.org (with Celery)	Selena Deckelmann, Jason Thomas
RapidJSON	A fast JSON parser/generator for C++ with both SAX/DOM style API, lua_sandbox_extensions	Mike Trinkala
Raven	Raven is a python client for Sentry	Cloud services Team
ReactJS	Javascript library for building user interfaces. Used by Firefox Hello & DevTools	Mark Banner, Nicolas Perriault
Read the Docs	Hosted automatically-built documentation, used by Cloud Services and a wide variety of mozilla Github projects	Ben Bangert, Jannis Leidel, Gervase Markham
redash	Data analysis and dashboarding tool	Rob Miller
Redis	Really fast data structure store, cache and message broker	Cloud Services Tarek Ziade's team, Loop Server (Hello) team
Redux	Redux is a predictable state container for JavaScript apps.	Jason Laster, Nicolas Perriault
Redux-saga	An alternative side effect model for Redux apps.	Nicolas Perriault
Requests	"Python HTTP Requests for Humans". Used by many many Mozilla Python projects.	Member of Jonathan Griffin's team
Review Board	The base of MozReview, the new review tool being developed to replace Splinter	Steven MacLeod, Mike Conley
Rietveld	Code Review, hosted on Google App Engine, used by Daala team.	Ralph Giles
Ring	Safe, fast, small crypto using Rust.	Diane Hosfelt
rlz	Library for grouping promotion event signals and anonymous user cohorts
Salt	Python-based configuration management software.	Jack Moffitt
Sass	CSS Preprocessor. Most big team web projects use Sass these days.
SCOWL	en-US word list used for spell checking.	ehsan
sctp	SCTP stack
Selenium	Browser test driver	David Burns, Dave Hunt
Sinon	JavaScript mock library	Cloud Services, Tarek Ziade's team (kinto.js); Firefox Hello team
Skia	A complete 2D graphic library for drawing Text, Geometries, and Images	Platform Graphics Team
SlimerJS	Scriptable browser, based on Gecko, used for functional tests in some few Mozilla projects ( PluotSorbet, some FxOS apps ? and others ?)	Myk Melez
Spark	Spark is a fast and general cluster computing system for Big Data.	Roberto Agostino Vitillo
Sphinx	Documentation builder used for Fathom, DXR, and probably other projects	Erik Rose
SQLAlchemy	Database Toolkit and ORM for Python	bhearsum
SQLite	File-based database	asuth
Squid	Caching proxy	Brian Hourigan
SRTP	SRTP protocol library
Stanford CoreNLP	Natural language analysis tools used in FOSS Heartbeat	Don Marti
Stylus	CSS Pre-processor on several sites	webdev
Subversion	https://svn.mozilla.org (Planning to decommission in near future)	Unknown
suricata	IDS / IPS / NSM engine	Michal Purzynski
TernJS	Code analysis engine for JS
three.js	3D JS library; used by A-Frame	Lars Bergstrom
Tox	Test automation	Dave Hunt
Travis	Continuous integration system used by several teams (eg Treeherder)	Jonathan Griffin's team and Lars Bergstrom
twemoji	Upstream Emoji artwork used in the Firefox built-in Emoji font (minor source)	Tim Chien (See emojione-colr)
The Unicode Consortium	Their work underpins most of what we do	Richard Soderberg
UWSGI	Full hosting stack used in MozDef	MozDef Team in EIS
Vagrant	Build and distribute dev envs, used by Treeherder and others	Member of Jonathan Griffin's team
Valgrind	Memory error detection and profiling of C and C++ code	jseward, njn
VideoLAN	Free software for multimedia	Timothy B. Terriberry
vscode	Code editor	unknown
vim	editor used by many developers	—
waffle.io	github project management used by various teams
web-platform-tests	Testcases and tooling for cross-browser testing of web-platform APIs	jgraham
WebPack	A bundler for javascript and friends	Nicolas Perriault
WebRTC.org	Components to support real-time communication in browsers and mobile applications	Randell Jesup
woff2	Reference library for WOFF font format
WordPress	Powers our blogs, blog.mozilla.org	Craig Cook
Wt	C++ library for developing web applications, hindsight_admin	Mike Trinkala
x509lint	Certificate checking tool, used by the Root Store team	Kathleen Wilson
Xiph.Org	Media codecs ship in Firefox, encoding tools; includes libogg	Ralph Giles
xxHash	Extremely fast non-cryptographic hash algorithm, lua_sandbox_extensions	Mike Trinkala
XZ Embedded	Decompressor for the XZ format
yasm	Assembler used by the build system.	unknown
YouCompleteMe	Code completion engine for vim editors	Ehsan Akhgari
zlib	Streaming compression and decompression for HTTP, PNG, etc.
Zappa Serverless Framework	Framework for porting Flask, Djangon, other python apps to aws Lambda. Used in Risk Heatmap and Second Opinion	Andrew Krug
ZooKeeper	Distributed synchronization, use by hg.mozilla.org replication	gps