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