Yes. I own them on physical media. Just looked up digital versions: They still aren’t available on GOG, what a shame.
You can get all three of them on Steam. The first one (Ankh - Anniversary Edition) is available DRM-free at FireFlower Games (wow, another shop redirecting from HTTP to HTTPS, but at least this one is DRM-free only).
I played the first Ankh game ten years ago. I remember that I disliked some puzzles and that the game was not really bug-free. Also, I didn’t like the controls, which were obviously inspired by the GrimE games. I never played the sequels for this reason (only the demo for the second Ankh game).
Please keep in mind that this was my opinion ten years ago. Maybe I would have enjoyed it more nowadays. Who knows.
A while ago I read some rumors about the devs being pulled into other Valve projects, but that makes it sound as if it’s no longer going to happen at all . So there goes another one of the games I really wanted to play. Oh well, there’s still Sable and Yes, Your Grace to look forward to next year.