If by some chance you don’t own Quake games yet, you can by them if you want. GOG sale is live already, Steam will probably appear at some point soon.
There is a rumor Quake2 may have a remake similar to Quake1 and that it will be announced during Quakecon, so might be a good idea to own Quake2 on Steam in case they give it for free.
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Kind of odd that Quake2 on Steam is not on sale. There are also some avatar you can claim on August 10th: https://store.steampowered.com/news/group/33028765/view/3687932599975160360
Notice one of them is Quake2.