Well not too much here, just a couple libraries I've put together
over the last 5 or more years. The following protocols/formats are supported:
*BASE32/64 encoding decoding
*Sockets (transparent OS functions & and OpenSSL encryption)
Anways, you can browse the most recent code here
I would consider most of the libraries to be more or less complete.
For example CGI supports files, HTTP was built for GUI and CLI, and SMTP supports STARTTLS.
There is a socketpair() for windows and many other functions for OS transparency
All code is under a BSD-style license unless stated otherwise.