I don't know if anyone here has heard of this game: http://play0ad.com/
It's basically the same time period as EB but in real-time. There is an intriguing campaign concept similar to Total War, though. Overall, it seems pretty historically accurate, except for some glaring errors (such as Persians contemporary with Seleucids). It has good graphics but can get extremely laggy sometimes. Just bear in mind it is in early alpha. And most importantly, it's free.
Also, it has bedouin camel archers:
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