For C (and CPP obviously):
Include a fast and tiny RAM-tracing feature for Real-Time (RT) debugging purposes.
>> ONLY FOR DEBUGGING <<
Very much faster than printf-debugging, which may result in unforseen results in an RT environement.
Feathery is a very small and full-featured ftp server for embedded devices. It is easy portable to every 8, 16 or 32 bit architecture and can run with or without an operating system.