autossh

Features:

- autossh is a program to start a copy of ssh and monitor it,

 restarting it as necessary should it die or stop passing traffic.

 The idea is from rstunnel (Reliable SSH Tunnel), but implemented in C.

- The author's view is that it is not as fiddly as rstunnel to get

 to work.

- Connection monitoring using a loop of port forwardings or a remote

 echo service.

- Backs off on rate of connection attempts when experiencing rapid

 failures such as connection refused.

- Freeware.