Good to know: Use the tools you prefer. I personally love Fork for my Git bloatware uses, and JetBrains Rider for my IDE. However, we do not discriminate, even, if you're using VIM.
- John
A quick web search will teach you how to do any of these steps
Fork the SS3D repository.
Find a task to work on.
Open a pull-request to the develop branch.
Pretty easy right?
For the game engine, we are using Unity.
To network the game, we are using Fish-Net: Networking Evolved.
We use DOTween for tweening purposes.
We also use the CS Framework.
Read about GitFlow.