Top 15 level-editor open source projects

Flexible level editor

Kirby's Adventure Level Editor (C++ / Qt)

The open-source, cross-platform level editor for id Tech based games.

Level Editor for the PC version of Sonic Generations

Miceditor: Transformice map editor

A web based level editor for Super Mario Advance 4, the GBA port of Super Mario Bros 3

Wario Land 4 Level Editor.

A supercharged fork of the modern day level editor.

A set of modding tools (level editor, etc) for the Ratchet & Clank PS2 games.

Level editing suite for The Legend of Zelda: The Minish Cap

(WIP) Fully playable, open source recreation of every Rhythm Heaven minigame with a built in level editor.

A custom Source Engine level editor written in Go

Advanced, but simple to use, runtime level editor for Unity.

N-Space: a mobile app for building 3D interactive worlds

Monogame renderer and importer for LDtk Level editor