• Geany (text-editor)
• Git (version control system used by Nightingale)
• SVN (version control system used by Songbird)
• Sass CSS Tool
• Meld Visual diff, merge tool
• GStreamer Multimedia framework
• PHP Server-side coding language (Featherweight)
• Python Script language (some scripts)
• node.js JavaScript framework (some scripts)
• XULRunner Mozilla framework
• Sublime Text Text editor
• Bash scripts (some scripts)
• MAR Mozilla ARchive (to generate Nightingale updates)
• jq Command-line JSON processor (to parse .json files)
• rsync Utility to synchronizes files (to upload nightlies on sf.net)

(See Cross-platform tools)

• Paint Shop Pro Graphics editor
• Photoshop Graphics editor
• TortoiseGit Graphical tool for Git
• GitHub Windows Git Front-end for Windows
• TortoiseSVN Graphical tool for SVN
• MozillaBuild Tools needed to build
• Visual Studio 2008 Express (VC9) with C++ compiler
• Windows SDK
• Windows Driver Kit (only needed to build the unsupported iPod add-on)
• Notepad++ Text editor with Syntax highlighting

• Xcode 4 (IDE)
• MacPorts (Ports)

• GitHub (Code/issues)
• Sourceforge (Hosting deps/releases/testing/nightlies)
• BabelZilla (localization) running on Transifex
• OpenGrok (code search) (Install tutorial)
• WordPress (Blog)
• MyBB (Forums)
• DokuWiki (Wiki)
• Bugzilla (Bug tracker used by Songbird)
• CodeIgniter (PHP Framework)
• Persona Universal Login system by Mozilla

• Developer Tools (XUL Tools to quickly start an add-on with sample code)