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qmail is a modern SMTP server which makes sendmail obsolete, written by Dan Bernstein. Qmail was released under the public domain in november 2007.
Small, secure dns cache and resolver written by Daniel J. Bernstein, the author of qmail. djbdns is extremely fast, very secure and easy to configure (think 'opposite of bind zone files').
Reimplementation of the SixXS heartbeat protocol in shell (mksh, actually). Both client and server are provided. This can be used as a client to the SixXS IPv6 Tunnel Service Provider instead of their heartbeat client or AICCU, or to build a tunnel solution by yourself. In addition, it has been successfully used to provide Dynamic DNS.
libowfat aims to reimplement the API defined by prof. Dan Bernstein as extracted in the libdjb project. The API is also extended slightly.