Epip is a Divinity: Original Sin 2 mod which makes numerous improvements to UI & QoL, with extensive configurability and many systems to make further client-side modding easier.
Download and documentation: https://www.pinewood.team/epip/
The website is maintained in a separate repository at https://github.com/PinewoodPip/epip .
See https://www.pinewood.team/epip/Maintenance/ProjectSetup/ for project setup instructions.
The Epic Encounters discord server has a dedicated channel (#epipeline) for Epip development where issues and features can be discussed. Nightly/test builds are also posted there.
The GitHub issues board is not used much internally, but you can report issues there too if discord is to be avoided.