UDPonTCPproxy proxies UDP traffic from a set of ports over TCP tunnels. Server side NAT's the UDP ports to a chosen destination, then sends back destination's replies. Usefull to tunnel UDP over SSH tunnels to things like license or game servers.
SocksiPy - A Python SOCKS client module. It provides a socket-like interface that supports connections to any TCP service through the use of a SOCKS4, SOCKS5 or HTTP proxy.
Pycap provides the ability to capture packets from, and inject packets onto, network interfaces. It dissects commonly found structures in network packets such as Ethernet, IP, ARP, TCP, UDP, and ICMP headers.