tportknockd is lightweight but complete and fast port knocking daemon for Linux. It uses no extra libraries and is need about 30kByte space. Therefore it is most eligible for embedded networking devices like SOHO routers.
retawq is a multi-threaded web browser for text terminals on Unix-like computers. It is fast, small, nicely configurable and comfortable; e.g. you can keep open as many "virtual windows" as you want and work simultaneously in two of them.