All Half-Life games now free until Alyx launch

Valve has recently announced that they will br making all previous Half-Life games free to play until Alyx launches.

Half-Life: Alyx Dev Team Holds an AMA, Half-Life Games Currently Free on Steam

Valve Swears 'Half-Life: Alyx' Is Actually, Legitimately Done

Half-Life: Alyx' mod 'Levitation' gets seven minutes of new footage

Finish Half-Life: Alyx without VR in this mod

Is this the right order to play Half Life in? Are there any more games other than these? : r/HalfLife

The Half-Life Series is Free to Play Until March 2020

Valve didn't want to make another Half-Life game before Source 2 was ready

Valve makes all Half-Life games free to play for a limited time

Every Half-Life Game Is Free to Play Until April 1st - IGN