TeraTerm

TeraTerm Pro
Enhanced Terminal/Telnet/SSH2 Client

Tera Term, has become the tool of choice for many... becouse it does what it says on the tin, i.e. its a very good terminal program...

Get TeraTerm
TT Pro 3.1.3 has been out for some time now and is stable you can find it here on the official site.

An older version is avalible on the Official old site

More Com Ports
TTP as standard only "supports" com ports 1-4, if your com ports are named higher then that try this hint (found here)

* Open the teraterm.ini file using your favourite editor * Find entry "MaxComPort" * Set it to any value up to and including 16. * Save and restart TeraTerm