This is the most comprehensive list of software for Mac OS X software. Updated fulltime, all the time. Highly recommended. Click here to visit this site to find current versions for most OS X software titles.
VersionTracker has recently become a CNet site.
Quoted from the versiontracker site.
Nearly ten years ago, founder Kurt Christensen, then a Macintosh Systems Administrator, was looking for a way to track the myriad of software releases popping up on the Mac platform. He started posting a web page each day listing all the latest updates, including links to the developer and the download. It seemed useful, so Kurt mailed it out to his friends. He had invented the first “software update site,” a concept that turned out to meet a giant untapped need. Within a year, VersionTracker.com was one of the most popular Mac sites on the web.
What began as one man's organizational tool has evolved into an award-winning, computing resource for Macintosh and PC users.