Syndicate Wars Port
swars.vexillium.org
swars.vexillium.org
http://satellitereign.com/the-game/
Which is a quite decent updated version of the concept. Has one or more of the original Syndicate guys working on it and was quite fun to play.
It wouldn't even be that bad if you could replay the whole mission in 5-10 minutes like I remember from Syndicate. But in SR even walking around feels super slow. It's just not the same kind of action. You sneak around for 15 minutes, take out guards one-by-one, then suddenly you're spotted by the last remaining one and reinforcements come out from the building right next to you. You lose the whole squad, try again.
The one thing I do miss in SR from Syndicate is that in SR all targeting is manual, whereas if you ramp up one of the sliders in Syndicate they'll pick their own targets.
I solved this. The center required all of my soldiers to be maxed out, and all of them carrying lasers. Iirc... it feels like several lifetimes ago...
I'd give it a go but after moving about 15 times there's no way I have that CD.