SpeedReader helps you improve your reading speed. It is simple, interesting, challenging, and fun to play with. From a developer's point of view, it is extensible (Plugins), and as simple as possible (but no simpler). Functionality is only added if it improves the above stated goals.
netstiff (formerly known as webdiff) is a powerful Web and FTP site update checker. It supports a variety of different methods (diff, HTML, size, date, MD5 sum, regexp) to check for updates. There are also sophisticated settings to make it useful for partly dynamic Web pages. Without any given arguments, netstiff will either run its interactive configuration tool or check your sites for updates and print the changes in a diff(1)-like manner.
Ruby Dynamic DNS Client is a highly customizable, easy-to-use dynamic DNS update client. It features the ability to retrieve the IP address (using ifconfig or over the Web), support for various dynamic DNS services (dyndns.org, changip.com, cjb.net), support for multiple languages (Dutch, English, German, Italian, Romanian, Spanish), and a config file generation script.
deplate converts wiki-like markup to LaTeX (standard classes, koma, dramatist, sweave), HTML/PHP (single page, chunked/website, HTML, or s5-based slideshow), DocBook (article, book, man/ref page), and really plain text. Currently supported input formats are viki and Ruby's rdoc. The viki markup supports footnotes, citations, index, table of contents, embedded LaTeX for mathematics, integration with R for dynamically generated figures and tables, and more. Output can be customized via page templates.