Hey cool!

I admin/am with a curator group that crowdsources this within Steam itself, alongside noting when DRM free alternatives are available when the Steam copies aren't DRM free (which happens sometimes).

Check it out here:
https://store.steampowered.com/curator/33471358-FCKDRM/

p.s. I didn't create the group originally, so the name is a carryover from the creator being inspired by GOG's FCKDRM push at the time. If memory serves changing it risks breaking things.