Prefect

license

Apache-2.0(OSI)

source

public

core-gated

ungated

Fully OSI-licensed, no open-core split observed on the repo. The LICENSE is the full Apache-2.0 text, the whole framework - servers, apps and clients - is in the published tree and installs from PyPI with no key, and Prefect maintains it rather than selling a tier of it.

• https://github.com/jlowin/fastmcp recorded 2026-08-13

  Repo page - Apache-2.0 badge, 27,203 stargazers, the whole framework in the tree, maintained by Prefect. No enterprise directory, license key or paid tier.

• https://raw.githubusercontent.com/jlowin/fastmcp/main/LICENSE recorded 2026-08-13

  The full Apache License, Version 2.0 text.