curl
curl is installed on virtually every connected device in the world (25+ billion installations). It's the command-line tool and C library for transferring data with URLs — supporting HTTP, HTTPS, FTP, SFTP, and 25+ other protocols. Used by every major language and platform. Best for API testing, scripting, and any HTTP operations from the terminal.
AI ToolFree Tier: Fully free, open-source (MIT-like)Company: Daniel Stenberg / curl communityCategory: Git ReposOpen Source: YesQuick Start: curl is pre-installed on most systems → curl https://api.github.com/users/octocat → Pipe JSON through jq for formatted outputVisit curl