Repology is described as 'The packaging hub. Repology monitors a huge number of package repositories and other sources comparing packages versions across them and gathering other information' and is an website in the os & utilities category. There are three alternatives to Repology, not only websites but also apps for. The best Repology alternative is DistroWatch, which is free. Other great sites and apps similar to Repology are pkgs.org and Anitya.
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...
The pkgs.org is created to provide you with the simplest method of searching and downloading the newest versions of the Linux packages without the usual excessive popups or spyware.
Canada
DistroWatch primarily tracks (GNU/)Linux & xBSD distros alongside a few selected packages. Repology claims to "monitor a huge number of package repositories and other sources comparing packages versions across them and gathering other information". The only difference is scope.