level-editor topic
TrenchBroom
Cross-Platform Level Editor
sledge
An open source alternative to Valve's Hammer Editor for the Goldsource engine. (No longer in development)
DarkRadiant
DarkRadiant is the map editor for The Dark Mod and other idTech4/Doom3-based games
advanced-level-editor
Advanced, but simple to use, runtime level editor for Unity.
unity-polygon-2d-editor
Uses the collider of a PolygonCollider2D to generate a mesh for a Unity GameObject.
Miyamoto
A supercharged fork of the modern day level editor.
OdysseyEditor
Experimental level editor for Super Mario Odyssey (EditorCore plugin)
minishmaker
Level editing suite for The Legend of Zelda: The Minish Cap
wrench
A set of modding tools (level editor, etc) for the Ratchet & Clank PS2 games.