Netwib is a network library providing :
  - network features :
    + address conversion
    + UDP/TCP clients/servers
    + packet encoding/decoding/displaying
    + spoofing
    + sniffing
    + etc.
  - and general features :
    + data conversion
    + linked list, hash
    + portable threads
    + etc.
Using all these functions, a network program can be quickly created.

WWW: http://www.laurentconstantin.com/en/netw/netwib/