itch.io

A quick and easy to use drag and drop retro game creator for your favourite handheld video game system

Open-source game engine

A Blender add-on for building tile based low-poly scenes with paint/map editor like tools

AppGameKit Studio is a fully featured game development tool set.

Free and open source 2D and 3D game engine

Open-source, cross-platform game creator designed to be used by everyone

3D Game Engine for Blender

Roguelike Ascii Editor