Every year Valve holds a unique contest during The Steam Winter Sales called The Steam Awards. Games compete in many different categories and all games from pay-to-play to free-to-play games can participate. The votes have been counted, the community has spoken, and these are the winners of the second ever Steam Awards!
source: store.steampowered.com
The Steam Winter Sales 2017
The Steam Awards 2017 (Part 2)
SteamDirectly.com