Spinner is useful for keeping telnet and ssh links from dropping due to inactivity. Many firewalls and some ISPs drop connections when they are perceived as idle. By having spinner running, the server is constantly sent a tiny amount of data over the link, preserving the connection. Spinner thus acts as a keep-alive. It displays a little "spinning" ASCII character in the top left corner of your terminal. It supports any terminal capable of handling VT100-style escape codes. Spinner can also function transparently by only sending null characters to the terminal. In this mode Spinner supports any terminal. It also has a mode called "Ghost in the Machine" in which you can use Spinner to write the spinner character to any TTY, not just your own.
Enhanced Reverse Pimpage is an enhanced version of the original rpimp by Matt Miller. Reverse Pimpage was designed to allow you to access a computer that is behind a firewall from outside that firewall itself. The way it accomplishes this is by having the client (the computer behind the firewall) send a SYN request to a certain port at certain intervals. The computer that will access the client must run the server program, and when the time interval is up it will connect. Once it's connected, the client telnets to itself and routes data back and forth between the two.