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Free API Development tools
Verified FREE and FREEMIUM tools listed in API Development.
relaticle.comfree
CRM with a production-grade MCP server (32 tools) for AI agents, human-in-the-loop approvals, REST API, custom fields, and kanban boards. ([Source Code](https:/…
espocrm.comfree
CRM with a frontend designed as a single page application, and a REST API. ([Demo](https://demo.espocrm.com/), [Source Code](https://github.com/espocrm/espocrm)…
yeti-switch.orgfree
Transit class4 softswitch(SBC) with integrated billing and routing engine and REST API. ([Demo](https://demo.yeti-switch.org/), [Source Code](https://github.com…
linkace.orgfree
Bookmark archive with automatic backups to the Internet Archive, link monitoring, and a full REST API. Installation is done via Docker, or as a simple PHP appli…