Freshmeat page: http://freshmeat.net/projects/libspopc/
libspopc is a tiny pop3 client library written in C. libspopc work on linux, macosX and windows. It is simple and easy and is now used by several embeded programs. libspopc support also SSL encrypted connections over port 995.
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!