This github page holds the code for Unity plugin Realtime-CSG https://assetstore.unity.com/packages/tools/modeling/realtime-csg-69542
You can find the discord server here: https://discord.gg/BK5gt8R
The project website is here: https://www.realtimecsg.com/
If you use the source code, especially when it comes to finished projects, please let us know!