More details can be found on this absolute monstrosity of a website, if you're able to navigate it: https://omni-automation.com/
All plugins are in the /plugins directory, along with a more detailed README for each plugin.
I've been using this custom GPT for generating plugins. It does a pretty good job! https://chat.openai.com/g/g-1bLam9r4W-omniautomation-assistant