Charles is an HTTP proxy / HTTP monitor / Reverse Proxy that enables a developer to view all of the HTTP and SSL / HTTPS traffic.

mitmproxy is an interactive TLS-capable intercepting HTTP proxy for penetration testers and software developers.

Varnish is an HTTP cache.

Insomnia REST Client is a REST API Client with cookie management, environment variables, code generation, and authentication for Mac, Window, and Linux.

Apache CouchDB is open source database software.

Axel tries to accelerate HTTP/FTP downloading process by using multiple connections for one file. It can use multiple mirrors for a download. Axel has no depe…

Abyss Web Server is a compact web server available for Windows, Mac OS X, and Linux operating systems.

lftp is a command-line file transfer program (FTP client) for UNIX and Unix-like systems.