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.

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

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

Your Own Level Editor Creation Kit

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

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

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.

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

Free procedural level generator for unity

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

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

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

an editor for cooked unreal engine 4/5 maps

Monogame importer, renderer and code generator for LDtk Level editor