Shogo is also available at GOG.
Presumably, The Operative: No One Lives Forever, the sequel, and Contract J.A.C.K. (the spinoff) are stuck in limbo due to them being published by Sierra and possibly lost in the Vivendi sellout. And Aliens Vs Predator 2 and Tron 2.0 are likely stuck in lawyer hell due to them being sorta movie tie-ins.
I have no idea why Claw isn't available anywhere. The demand is there.