Polaring is a webbased software for viewing workouts recorded by either a Polar or a Garmin watch. (Garmin support is found in the polaring package as of version 00.04.01.)
Polaring is written in HTML and PHP. To use it, you need to put it up on a web-server -- apache or some such.
If you want to see Polaring in action, go to Testpolaring.