uIP is a very small implementation of the TCP/IP stack that is written by Adam Dunkels . More information can be obtained at the uIP homepage at http://www.sics.se/~adam/uip/.
TCP/IP stack with all-static allocations designed for bare metal (no operating system) embedded applications with minimal footprint.
A github'ified version of http://www.airspayce.com/mikem/arduino/RadioHead/