All Half-Life games are now free to play on Steam for a limited

Steam giving away six new free games for July

Half-Life is a free game on Steam, for now

Half-Life: Coop mod - ModDB

Half-Life Is Free-to-Play on Its 25th Anniversary With New Updates

Half-Life: MMod on Steam

Half-Life is currently for free to keep on Steam : r/linux_gaming

The Half-Life games are free on Steam for the next two months

Half-Life : MMod - ModDB

Half-Life gets a massive update restoring cut content and fixing