motionEyeOS - A Video Surveillance OS For Single-board Computers
Unity - The multiplatform game creation tools for everyone.
Unifi Video - Unifi Video by Ubiquity is designed specifically around Ubiquiti range of cameras and is free.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Camlytics - CCTV, IP, NVR & webcam recording, video analytics and heatmaps.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.