A lightweight game server framework implemented with Actor Model
Godot game template and component-based framework
3D game engine/framework in C, with Luajit and Python bindings now
An MVVM & Databinding framework that can use C# and Lua
BizHawk is a multi-system emulator written in C#
Extremely fast enterprise server framework, can be used in RPC
LÖVE is an awesome 2D game framework for Lua
Cross platform SDK
Open-source, cross-platform, game-development tools