Black Mesa is finally done! If you're even remotely a Half-Life fan, you should check it out.
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Well, it's mostly done (it stops when you teleport to Xen, which really - can you blame them?)

8 years in the making and I haven't even made it to the resonance chamber because I'm having so much fun listening to the voice work (and when was the last time you could say that about a fan mod?) and reading whiteboards. Seriously, talk to people over & over, throw objects at them, and turn on the dialog subtitles before you loiter outside the G-Man conference room.