This is an ode to Dirk Engling’s OpenTracker.
It’s a BitTorrent tracker.
It’s what powered The Pirate Bay in 2007–2009.
I’ve been using it to power the downloads on http://driverpacks.net since the end of November 2010. >6 years. It facilitated 9839566 downloads since December 1, 2010 until today. That’s almost 10 million downloads!
Stability
It’s one of the most stable pieces of software I ever encountered. I compiled it in 2010, it never once crashed. I’ve seen uptimes of hundreds of days.