Our main software repository is located here https://gitlab.com/sweetie-bot/sweetie_bot
And there is the mirror on github.
There is installation instruction in the readme. Anyone can install it on linux PC and experiment with the robot in a virtual 3D environment.
It's still WIP. We are looking for C++, python and java developers. If you would like to help join us at discord server https://discord.gg/PVMgEYx