JudasIscariot: Xenonauts has a native Linux version and is turn-based.
I got this one and I am giving it a shot tonight.
ZFR: Jagged Alliance.
Heroes of Might and Magic 2.
Both should have a DOSBox version.
Played them both. I like Heroes of Might and Magic 2 more then Jagged Alliance.
DampSquib: Breach and Clear.
Added to my wishlist - Looking at some reviews/gameplay vids.
gooberking: Battle Worlds Kronos is Linux, TB, and on GoG. I haven't played more than a few minutes of it at this point so I don't have any opinions as to how good it is.
Hmmm. I like what I see on this one.