HexInject is a hexadecimal and raw packet injector and sniffer. It can be easily combined with other tools to provide a powerful command line framework for raw network access. It will automatically set the correct checksum (IP, TCP, UDP, ICMP).
sthttpd is a fork of thttpd, a simple, small, portable, fast, and secure HTTP server which implements little more than just HTTP/1.1. sthttpd aims to maintain the small footprint of its parent while keeping up with security and other bugfixes.