Flash game developers work in many disciplines, each requiring a hefty set of tools. Check out this great and ever-expanding list of time-saving and productivity-enhancing tools that will help you to create games painlessly.

Art & Animation

• Ginger Bitmap Animation Engine - A very advanced and optimized animation engine for AS3
• Cartoon Solutions— free animation tutorials.
• GIMP— free editing tool for graphics.
• Ultrashock— Ultrashock's great library of assets.
• Game Thumbnail Icon Generator - Make all the icons you need for your game with a simple source image.

• Animo— 2D animation software.
• Toon Boom Studio— 2D cartoon animation software that outputs in SWF format.
• Swift 3D— 3D animation software that outputs in SWF format.
• SwishMax— an alternative to the Flash IDE, offering many animation tools.
• swf2imgseq — a tool to export the main timeline of a swf to a image sequence.(Embedded MCs are animated. Programmed animations are exported.)
• Thumbnail Icon Generator - an excellent thumbnail generator offering different sizes in one go!

Analytics

• Mochi Analytics
• Google Analytics Tracking For Adobe Flash

Code Editors 

• Adobe Flex 3
• FlashDevelop — a popular open-source ActionScript 2/3 and web development environment.
• PowerFlasher FDT — a professional ActionScript IDE focusing on RIA and application development
• SE|PY ActionScript Editor — a cross-platform ActionScript 2 development environment.
• Adobe Flash CS3

Debuggers 

• Alcon — debugger based on Adobe AIR.
• XRay — open-source debugger.
• SOS — a commercial debugging app.
• Flash Tracer — an extenstion for Firefox to view trace statements right in the browser. 

Distribution 

• Mochi Game Distribution
• 45+ Sites To Submit Your Flash Games— MochiLand article.
• Flash Games Database

Encryption Tools

• Tutorial: Protecting Your Flash Game— MochiLand article.
• Mochi Live Updates — Mochi's own upload-and-go service.
• Amayeta SWF Encrypt — a desktop SWf encryption program for Windows and OS X.
• Flash Encryption Genius
• Kindisoft secureSWF — a desktop SWf encryption program for Windows, OS X and Linux. 

High Scores

• Mochi Scores API— MochiAds' own Scores API, which allows you to easily integrate high-score tracking into your games.

Monetization

• Mochi Ads - ads for Flash games
• Mochi Coins - micro-transactions for Flash games

Multiplayer APIs and Services 

• Come2Play— white label multiplayer API.
• Nonoba multiplayer API
• SmartFoxServer
• Electro Server
• Red5— open-source Flash Server. 

Sound Editing

• Audacity— free sound editor. Good for quick wave edits. A little techy in the interface but get’s most jobs done well.
• Apple Logic Pro 8— Apple's sound editing software.
• Apple Sound Track Pro— Apple's sound editing software great for loops and sound effects.
• Tools of the Trade— MochiLand article.
• SFXR - Create unique old-school sound effects with just a few mouse clicks.

Sound Libraries

• FindSounds— sound search engine.
• Shockwave-Sound.com— Good library for music and Effects. Easy to browse and listen to samples.
• Sound Rangers— great source for cheap sound effects.
• Newgrounds Audio Portal— community audio portal on Newgrounds -> Ask permission from the author
• Kongregate Sound Collabs - Creative Commons licensed sounds & music by Kongregate community
• Sound Snap—  download 5 free sounds a month.
• flashkit.com
• http://www.grsites.com/ - Large collection of sounds and effects
• http://www.soundrangers.com/ (not free)
• http://www.audiosparx.com 

Audio and Music Production Services

• http://www.walzmusic.com - custom music, voice overs and sound effects
• http://www.symphonyofspecters.com/ - custom audio and sound design
• http://www.audiodraft.com/ - custom music and sound design 

Game Engines

• http://www.ffilmation.org - The FFilmation Engine is an AS3 isometric programing engine, focused mainly on game development.