LibTorrent is a BitTorrent library written in C++ for *nix, with a focus on high performance and good code. The library differentiates itself from other implementations by transfering directly from file pages to the network stack. On high-bandwidth connections it is able to seed at 3 times the speed of the official client.
The client uses ncurses and is ideal for use with screen or dtach. It supports saving of sessions and allows the user to add and remove torrents.
Nagios is a powerful host and service monitoring program designed to run on most *nix systems. It is written in C and designed to be fast and flexible. It has the ability to contact administrators via email, pager, or other user-defined methods.
nslookup - *nix simple nslookup clone for the Win32 platform (Console Application)
/// Does A DNS lookup by Host Name or IP. Host Name lookups can return
/// multiple IP Ranges.