neon
neon is an HTTP and WebDAV client library, with a C
 interface.  Features:
- High-level wrappers for common HTTP and WebDAV operations (GET,
MOVE, DELETE, etc) - Authentication support including Basic and Digest support, along
with GSSAPI-based Negotiate on Unix, and SSPI-based Negotiate/NTLM on
Win32 - SSL/TLS support using OpenSSL or GnuTLS; exposing an abstraction
layer for verifying server certificates, handling client
certificates, and examining certificate properties. Smartcard-based
client certificates are also supported via a PKCS#11 wrapper
interface. - Abstract interface to parsing XML using libxml2 or expat, and
wrappers for simplifying handling XML HTTP response bodies - WebDAV metadata support; wrappers for PROPFIND and PROPPATCH to
simplify property manipulation. 
Low-level interface to the HTTP request/response engine, allowing
 the use of arbitrary HTTP methods, headers, etc.
Archives for old list:
neon is
 free software,
 distributed under the
 GNU Library GPL.
Patches, feature requests, bug reports,
 questions etc. can be
 sent to
 the neon mailing list (for
 which a web
 archive is also available).  The neon-commits
 list receives commit messages from the Subversion repository.
Current Release
Please note: The neon API is subject to
 backwards-incompatible change over minor versions (0.24.x -> 0.25.x)
 but is stable across patch releases (0.24.0 -> 0.24.x).
- Source code: neon-0.29.6.tar.gz
 - Reference documention
 - Subversion repository