MidEast Crisis is a total conversion for the EA game Command and Conquer Generals : Zero Hour. It is a mod featuring Israel and Syria in a hypothetical modern war setting.
A solid one, it's a total conversion so it introduces some pretty original features instead of enhancing the vanilla gameplay.
It adds two brand new factions - Israel and Syria, significantly more realistic than vanilla factions, but unfortunately there are just two of them, and the specializations you can unlock mid-game (instead of picking a general before the game starts) are rather disappointing. As for factions themselves, Israel sports more modern western equipment and relies on mobility, meanwhile Syria sticks to soviet-era weaponry and is somewhat more sturdy. Income systems are altered heavily - the dropped supplies were rendered more scarce and only good for early game, with captureable indestructible structures being the main income source. Each faction got a new secondary income source, strongly differing from vanilla ones - Israel can train journalists that apart from periodic income can photograph enemy units for extra funds, which is risky but rewarding, meanwhile Syria trains civilians and makes them occupy structures.
One problem is that, while it introduces some new factions that are really interesting, it still lags behind the vanilla Zero Hour in diversity of units, and you don't get anything crazy awesome like modular supertanks or toxin sprays, that's the price of realism.
It has a good multiplayer potential, but I can't imagine it remaining attractive for long while.