The W3C WWW library libwww is a highly modular, general-purpose client side Web API written in C for Unix and Windows. It is well suited for both small and large applications, like browsers/editors, robots, batch tools, etc. Pluggable modules provided with libwww include complete HTTP/1.1 (with caching, pipelining, PUT, POST, Digest Authentication, deflate, etc), MySQL logging, FTP, HTML/4, XML (expat), RDF (SiRPAC), and much more. libwww homepage: <http://www.w3.org/Library/>