GoldSrc
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Proprietary
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However, there are Xash3D-FWGS and Xash3D , which emulate and are compatible with GoldSrc.
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Half-Life.
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Team Fortress Classic.
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Counter-Strike.
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Counter-Strike Online.
Source
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Source is free, and it will only cost money if used for commercial products.
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Half-Life 2.
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Half-Life: Source.
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CSGO.
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Team Fortress 2.
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Black Mesa.
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Left 4 Dead.
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Portal.
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Portal 2.
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Garry's Mod.
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Counter-Strike: Source.
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Vampire: The Masquerade.
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The Stanley Parable.
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Insurgency.
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Based on the Source Engine:
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Apex Legends.
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Titanfall.
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Titanfall 2.
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Source 2
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Source 2 will be released to the public for free, and it will only cost money if used for commercial products.
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Dota 2.
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Half-Life: Alyx.
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Aperture Desk Job.
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Counter-Strike 2.