Freshmeat page: http://freshmeat.net/projects/phpop/
phpop is a very simple Web-based POP e-mail reader. It lets you read, reply, forward, and delete messages from your POP server, as well as send new messages. It's written in PHP and utilizes the PHPLIB class library and the POP3 class.
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!