An open-source API client that stores collections as plain files.
Bruno is an API client for testing and documenting APIs, with collections kept as files that work with Git. It is available as a desktop app.
The core app is open source; check the site for details on paid editions.
Local use does not require an account.
Information and links are accurate as of the time of writing and may change. Always verify on the official site. This is an independent guide, not affiliated with the listed services.