s6-dns is a small, efficient, complete, and IPv6-ready DNS client library, with synchronous as well as asynchronous APIs. It is designed to replace libresolv in projects that need to perform DNS resolution. It also comes with small command-line utilities to make common and not so common DNS queries.
clens is a convenience library that aids in porting code from OpenBSD to different operating systems. Operating systems traditionally have different enough APIs that porting code is painful and can litter pretty code with ugly #ifdefs. In order to keep code readable and drastically reduce the number of #ifdefs needed, clens brings other APIs or missing functions into specific OS "focus".
Micro Snake is based on a simple snake game by Simon Huggins. This version of the snake (worm) game is very small and only utilizes ANSI escape sequences to draw the board. Hence it is very suitable for small embedded systems with only serial or SSH console access. The code uses no curses or other heavy libraries, only ANSI escape sequences and the Unix "stty" command to setup and restore the display.
oed2dict is a set of scripts that convert the full Oxford English Dictionary v2 (CD-ROM version 3.0) into the jargon and DICT file formats. These can then be consulted with any DICT compatible dictionary lookup program. The resulting DICT files are much faster to use when compared with the proprietary program from the original distribution, and are significantly smaller, with the whole database only weighing around 190MiB.
m9u is a music server, similar to mpd or xmms2. It sits in the background, waiting for commands to be delivered via a 9p file system. m9u embraces the Unix philosophy of doing one thing well. As such, it does not try to catalog or otherwise organize music, but aims for the more humble goal of simply playing it. A side effect of this approach is that m9u is trivially extensible to domains aside from music (for example, an image slideshow).