Softros LAN messenger - LAN messenger for an internal office chat for home or business users. It does not require a server and is very easy to install and use. It supports personal chats, group chats, message brodcasting, files transfer and remote desktop access.
Unity - The multiplatform game creation tools for everyone.
MyChat - Secure instant messenger for any network
Godot Engine - Feature-packed 2D and 3D open source game engine.
BORGChat - BORGChat is a LAN messaging software program.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.