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In February Bethesda announced that it was shutting down its proprietary game launcher. It recently moved some of its classic games to steam.

Currently 3 of these games are free and it is unknown if this is temporary or permanent:

Elder Scrolls: Arena [steampowered.com]
Elder Scrolls II: Daggerfall [steampowered.com]
Wolfenstein: Enemy Territory [steampowered.com]