II-Agent is an open-source AI agent framework from Intelligent Internet, available on GitHub with about 3,391 stars under the Apache-2.0 license and most recently active in 2026. It is built for real work rather than demos: a general-purpose agent that can research, write, design, and build software end to end, and that you can run, fork, and extend yourself with no vendor lock-in.
The agent covers an unusually wide range of jobs. On the building side, it can go from a short prompt to a full mobile application or website, generate fully illustrated storybooks, and produce video and image content with multiple models inside one workflow, with live editing for websites, slides, and storybooks plus a visual plan mode for structuring a project before execution. On the research side, it offers fast research for quick answers and deep research for multi-step investigations, and can turn findings into interactive websites. You bring your own API keys, keeping full control over model providers and cost, and a hosted web app is available for trying it without setup. The project has also been demonstrated on the GAIA agent benchmark. It is positioned as open infrastructure for the agent era: enterprises can audit the code, self-host it inside their own environment, and adapt the agent’s tools and workflows to internal processes instead of accepting a closed platform’s limits.
II-Agent is free and open source under the Apache-2.0 license. You only pay for the model API usage you choose to bring.
II-Agent suits solo developers, research teams, and enterprises building internal agent tooling who want a capable, inspectable alternative to closed agent platforms.