ProstoServer is a universal library for building high-performance TCP servers running under Microsoft Windows. ProstoServer: manages client connections; sends and receives data asynchronously; organizes a pool of threads; provides basic protection against DoS attacks. The library is based on the Input/Output Completion Port (IOCP) mechanism - the most powerful tool for building servers in Windows operating systems. It allows ProstoServer to serve (for example, in the echo server mode) up to several thousand queries per second. ProstoServer is licensed as shareware, the cost of the registered version is $150 and full download size is 0.3 MB. You can download a free version of ProstoServer by following download link at Free Downloads section of this page. ProstoServer is developed or distributed by CBiT and is listed under development components & libraries.