I kept losing track of the open-source tools in the "AI agent" space. Every week there is a new one, and the word "agent" now covers very different things: a chat workspace you delegate work to, a Python framework you build with, a workflow tool with an AI step, a browser robot, a coding assistant. So I made a list, put it on GitHub, and built a small site to go with it.
It is here: aiagentplatforms.dev, source at github.com/Agenta-AI/awesome-ai-agent-platforms.
This post explains how I split the space, because the categories are the useful part.
The five categories
I found that "AI agent platform" only makes sense once you split it by the job it does.






