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The steam sim fest is on! From july 20th to july 24th, enjoy many deals on simulation titles.
(store.steampowered.com)
Steam is a video game digital distribution service by Valve.
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Useful tools:
SteamDB
SteamCharts
Issue tracker for Linux version of Steam
If you are into management / zoo tycoon kind of games, i recommend Megaquarium. It's fun and simpler than Planet Zoo, has some challenge too. On sale for ten bucks