Looks like 'Black Mesa - Xen' will be finally releasing on March 5th after like 14yrs of development. It is a remake of Half Life in the source engine. From the trailers and reviews I have seen Crowbar Collective has done a great job remaking Half Life. More of the classics should be given this sort of treatment.
Check it out here: https://store.steampowered.com/app/362890/Black_Mesa/