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Games like AutoLightmapUEr

Free, easy to use and flexible level editor.
Early access multipurpose plugin for Unreal Engine
Instanced Static Mesh Editing Made Easy
Paint 3D vector fields (optionally in VR) and save them out to .FGA format for use in other software, or your own games.
Rustangelo is an automatic sign painter for RUST.
Illustration-inspired visual effects for Unreal Engine
Create your whole tileset instantly.
Create your own 3D models and 2D sprites!
Visual planning ideaboard, by indie devs, for indie devs and creatives
Editor for pixel art animations
3D Game Engine for Blender
A Mesh Editor for Unreal Engine
Easily create 3D models and 2D sprites
Open Source 3D Game Engine
Easily create 3D grid-based, voxel-style RPGs, adventure games, and more!
A configurable UE4 game launcher plugin with graphics and keyboard settings
Unreal Engine plugin that automatically creates instanced materials for large numbers of textures.
A Pivot Editor for Unreal Engine.