level-editor

Flexible level editor

Modern, lightweight and efficient 2D level editor

Cross-Platform Level Editor

Realtime-CSG, CSG level editor for Unity

Work in progress prototype for the Chisel Level Editor, for Unity

Unity importer for the LDtk level editor

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

Dust Racing 2D is a traditional top-down car racing game including a level editor.

An open source alternative to Valve's Hammer Editor for the Goldsource engine. (No longer in development)

Your Own Level Editor Creation Kit

DarkRadiant is the map editor for The Dark Mod and other idTech4/Doom3-based games

tiny_csg is a C++ library that generates meshes from brush-based level data and supports incremental updates (real-time CSG). It is intended to be used as a backend in 3d level editors and/or generators.

an editor for cooked unreal engine 4/5 maps

Free procedural level generator for unity

Uses the collider of a PolygonCollider2D to generate a mesh for a Unity GameObject.

Unity level design plugin that adds support for Quake .MAP / Half-Life .RMF / Source .VMF, Q1 HL1 .WAD textures, and .FGD export.

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

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

A tilemap editor that aims to be simple, fast and lightweight.

Monogame importer, renderer and code generator for LDtk Level editor