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httest is a script based tool for testing and benchmarking web applications, web servers, proxy servers and web browsers. httest can emulate clients and servers in the same test script, very useful for testing proxys.
tcp/ip utility for testing network connections/ports
Sender is a windows tcp/ip client/host that lets you send and recieve text to and from tcp/ip ports. It now has a hex mode so that you can send any 8bit byte combinations. It can be used for testing simple pop and smtp connections (original project reason) or for any other protocols for which you may want to test by hand from windows.
Cross-platform C++ libraries with a network/internet focus.
NOTE: Current source code as well as bugs/patches are on GitHub:
https://github.com/pocoproject/poco/
C++ class libraries for network-centric, portable applications, integrated perfectly with the C++ Standard Library. Includes network protocols (Sockets, HTTP, FTP, SMTP, POP3, etc.), SQL database access and XML parsing. Licensed under Boost license.
The NandoF library contains useful C# code for many different purposes, including a MIME e-mail parser and POP3client, classes for reading and writing text in the CSV format, writing console, web and WinForms applications, manipulating text...
Jandy is an internet development framework based on Indy, designed to make writing web clients and servers easier. Currently only the HTTP client and HTTP server frameworks are working, but other protocols will be included, like FTP, POP3, SMTP, etc.