Alternatives to Sonic Robo Blast 2

Playstation 2 Emulator

Real-time strategy game engine for Westwood games

2D and 3D game engine

Adds an OpenGL renderer to the ZDoom source port

C# scripting capable version of Godot game engine

Open-source engine for Heroes of Might & Magic III

Voxel game-creation platform

Build engine port backed by GZDoom tech

Reimplementation of Sonic 3 & Knuckles (requires original game)

Arena-style first person shooter

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

PSP emulator