Freshmeat page: http://freshmeat.net/projects/hopp/
ABOUT HOPP: HOPP is a programmer-friendly PHP library. From this point of view HOPP is different from other PHP libraries which are user-friendly. I'm a programmer, so I don't care about user friendliness  and I definitely need programmer friendliness. PEAR is a programmer friendly set of libraries but they are object-oriented and I don't like objects. HOPP is function-oriented. The long_function_names are based on GTK style. There are also some container functions. I'm not sure about their friendliness, but they are definitely powerful and useful. Javier made a calendar container and I made some other containers I will be including soon. NOTES:  I'm refering to users who install things not users who visit pages.
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!