DistroWatch is described as 'The DistroWatch web site was first published on 31 May 2001. The concept started as a very simple table comprising of 5 major distributions and the chart only compared a few features (price, version, release date) and a few package versions (Linux kernel, KDE, GNOME, XFree86' and is a very popular Linux Distro in the os & utilities category. There are five alternatives to DistroWatch, not only websites but also apps for BSD and Linux. The best DistroWatch alternative is Linux Distro Chooser, which is both free and Open Source. Other great sites and apps similar to DistroWatch are Repology, OpenSourceFeed, OS.watch and The LiveCD List.
Very specific questions to help people find the perfect GNU+Linux distro to use.