The PGP Public Key Server is one of several major systems used around the world for storing PGP public keys. Its main author does not consider it a major engineering project (although it could still use more time than it gets), but a project which has social significance, as it aids people who wish to communicate securely and privately.
This project has the following developers:
New HTML Parser: The long-awaited libxml2 based HTML parser code is live. It needs further work but already handles most markup better than the original parser.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!