Here are most of the tools I use to develop my games:
- Haxeflixel as my development framework (which includes other tools such as Lime and OpenFL).
- FlashDevelop for my IDE.
- Pyxel Edit for art and animation creation.
- Reaper for music creation (with a bunch of free VSTs)
- LabChirp for sfx creation.
- git in combination with Bitbucket for my source control.
- LICEcap for creating animated gifs to show off.
- Paint.NET, gimp, and inkscape for image creation that isn't my in game art (banners, boxshots, etc.).