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FREE FTP Client Powerful FTP/HTTP Fast and Easy Download Manager

TamperData is an extension to track and modify http/https requests.

Send your mail through http proxy but not only the mail proxy

Provides HTTP Headers, response time and content for any queried URL

Packet analyzer with HTTP file capture and a neat Graphical Packets Mode. Free.

FREE FTP Client Powerful FTP/HTTP Fast and Easy Download Manager

The BdProxy acts as a SOCKS, HTTP, and HTTPS proxy server

Embedded HTTP/S Web Server and SDK to write dynamic HTML pages using C/C++