neowin[.]net/news/valve-makes-all-half-life-games-free-to-play-until-alyx-launches
Valve will be releasing the first Half-Life game since 2007 soon with Half-Life: Alyx. To celebrate the event and let those in the dark catch up, the company announced today that games in the Half-Life franchise are going free-to-play for a couple of months.The games participating in this promotion will be playable completely for free on Steam until Alyx's arrival in March. It's not just the mainline Gordon Freeman-led games either, as in addition to the original Half-Life, Half-Life 2, and Episodes, add-ons like Blue Shift and Opposing Force are included too.
Here's the list of games and their store links to begin downloading:
Half-Life
Half-Life: Opposing Force
Half-Life: Blue Shift
Half-Life: Source
Half-Life 2
Half-Life 2: Episode One
Half-Life 2: Episode Two