https://www.pcgamer.com/tomb-raider-1-2-and-3-remasters-coming-to-steam-free-for-owners-of-the-originals/

I had no idea that the first three Tomb Raider games were available on Steam but, yep, they're all there. However, they're the original DOS ports running through an emulator, which throws up a bunch of performance, resolution and control problems. Thankfully, more modern remasters are on the way that will run at 1080p with 60fps.

Realtech VR is the company handling the remasters, and it's basing them on the mobile versions of the games. You'll need to own the games on Steam in order to play the remasters because they're essentially mods of those versions, but if you do then they'll be completely free. The developer says it's looking at doing the same for GOG but isn't sure if it's going to be possible.