Now it's time to extend my collection of Feature Matrices.
First of all, there will be the List of Game Engines from English Wikipedia. It just includes a wiki table with rows for engines and columns for features. There are also a few versions of this page for other languages. But some of them (Russian and Ukrainian, for example) do not include columns for specific features, only textual descriptions.
Then, there is an old-time CMS Matrix which allows you to Compare Content Management Systems. This is a site similar to the WikiMatrix, but based on a CMS system rather than a wiki engine.