TkTemp is a program that converts between 7 different temparature scales, Centigrade, Fahrenheit, Kelvin, Rankine, Reaumur, Base360, Base360-2. It features slide scales and entry boxes. It also features a time client and telnet interface (disabled by default). It is written in Perl with the Tk library. It is open source and it is covered under the BSD Licence.
This is currently beta software. Some features may not work properly.