In recent years, there has been an explosion in open-source software licenses. There’s the GPL (under which the Linux kernel is licensed), the MIT license, the Mozilla Public License and countless others. This, however, may be my favorite one yet:
Most BitTorrent users have probably never heard of Opentracker, but there is little doubt that many of them will have used it. It is the piece of software that The Pirate Bay is running on, as well as the denis.stalker tracker. Together, the two trackers alone are responsible for the communication between 25 million BitTorrent peers at any given point in time.
Opentracker is a lightweight BitTorrent tracker which uses minimal resources. The software does not store any data or log any IP-addresses, supports UDP-tracking and is more stable and efficient than most other tracker software. Last year, The Pirate Bay started using the software, which allowed them to handle more users with the same hardware.
As with most software, Opentracker comes with a license, although it is an unusual one. The software is published under a Beerware license, meaning that if a satisfied user should ever run into the developer, he or she owes the developer a beer.