How-To:

1. Paste games (no keys) in comments using the <spoiler> tag for easier browsing.
2. Claim games via PM to the comment author.
3. Registering a game you already own invalidates the key.
4. optional: edit your comments to strike through claimed games

When buying games, prefer DRM-free platforms:

• itch.io
• gog.com
• Humble Store (DRM-free)
• FireFlower Games
• playing Steam games without the client
• more store recommendations via GOG forum

Also of interest:

• Steam Gifts (key exchange, bundle reviews, too)
• barter.vg (library management, lookup)
• SE Steam group

(thumb source)

Personal note: It keeps being a little grim, doesn't it? This place still being around is soothing and I feel it might never have been a better time to open it up for registrations again.
On the registration form, one might need to add a honeypot field and maybe a quiz captcha against hammerbots, but I guess we're willing to help with moderation, steele – thanks for keeping this site up!

P.S.: Did you know Steam game thumbs are available on a CDN URL under their store ID? I didn't.