Here are a few tools i know of
-Engines-
* Unity
* Unreal
* CRYengine
* Uhro3D ( or something like that )
* BUILD 2
* Quake Engine
* Source
* GoldSrc
* LOVE2D
* Cube2 Engine
* FPSCreator
* GameGuru
* Blitz3D
* BlitzMax
* Leadwerks
* Blender Engine ( for old versions of blender )
* ClickTeam Fusion 2.5
* Construct ( Free) 2 and 3 (paid)
* Buildbox
* Minetest (more of a game but still)
* 101 Game Engine
* CopperCube 6 ( or something like that)
* Danmakufu ( For Bullet Hells)
-DAWS ( Music Producers and audio editors)
* LMMS
* Fruity Loops studios 20
* MixCraft
* Majix
* Audacity
-Image Editors and Makers-
* Paint .NET
* GIMP
* Photoshop
* MS Paint -_-
* Plenty of online sprite creators
-IDEs-
* SASM ( Assembler code )
* Notepad++ (various)
* MS Visual Studios
* Netbeans
* Eclipse
* Notepad (wait a sec)
* Dev-C++
* Code::Blocks
* JEdit
* Easy64K
* XCode
Hope this helps you out :)
~ Star