Hodie prints the current date and time to stdout in Roman numerals, with grammatically correct Latin. Complete with Id., Kal., Non., pridie, postridie, bis, and all the other nice annoyances. As an option, it even provides you with current date according to Roman calendar -- that is 'ab urbe condita'; after Rome was built.
Hostinfo is a utility for looking up hostnames and IPv4 addresses. Hostinfo uses the gethostbyname(3) and getaddrbyname(3) function calls, which means it tells you what your operating system really thinks rather than simply doing direct DNS lookups. Hostinfo provides options for both displaying and interpreting IP addresses in hexadecimal and backslash-octal notations as well as in the traditional base-10 dotted-quad notation.
HTML TIDY is a free utility to fix mistakes made while editing HTML and to automatically tidy up sloppy editing into nicely layed out markup. It also works great on the atrociously hard to read markup generated by specialized HTML editors and conversion tools, and can help you identify where you need to pay further attention on making your pages more accessible to people with disabilities.
ICU provides a Unicode implementation, with functions for formatting numbers, dates, times, and currencies (according to locale conventions, transliteration, and parsing text in those formats). It provides flexible patterns for formatting messages, where the pattern determines the order of the variable parts of the messages, and the format for each of those variables. These patterns can be stored in resource files for translation to different languages. Included are more than 100 codepage converters for interaction with non-unicode systems.
Jigsaw is W3C's leading-edge Web server platform, providing a sample HTTP 1.1 implementation based on RFC2616 and a variety of other features on top of an advanced architecture implemented in Java. Jigsaw provides both client and server HTTP/1.1 implementations, is fast, easy to extend, flexible, and is also packaged as a ready-to-run HTTP/1.1 proxy-cache.