I'm working on MindRoot, which is a plugin-focused agent framework with a fully customizable chat UI and swappable services and commands as well as pipes, agents and personas. The goal is to be fully user-friendly while also easily expandable for programmers. And to make it easy to share tool commands and agents. Hopefully someday with a public plugin+agent+persona registry built in.

https://github.com/runvnc/mindroot