Tomb Raider (2013) is free on Steam right now, I'm a big fan of the game but it's certainly not everyone's cup of tea. Has competent Mac and Linux ports by Feral Interactive.
Lara Croft and the Temple of Osiris is also free, so it can't hurt to grab it, but it's also not that good. It has coop so you're gonna have a better time with friends. Windows only.