Capture part/whole screen/all screens inside or outside of your GM games
Debug commands mod for Nuclear Throne Together
Make Zip archives from GM games
Write high-level code for GameMaker projects in Haxe
Automatically makes a skin mod with default sprites for specified character+skin

Assets and examples

Multiplayer games/mods/collabs

Singleplayer games & collabs

Nuclear Throne mods

Userscripts & userstyles