P.S. I think there should be some descriptions of all the sites in the main list. And maybe a division by categories. And it'll be useful to display their urls - most of them have pretty common names so if anyone wants to suggest anything it'll be much easier to notice if it was mentioned there already.

Can I suggest http://custeam.io - it's a customisable homepage for the Steam overlay browser. It changes to display useful links relevant to the game you're playing. You can also search, add notes and more.