 If you liked
Kidou Senshi Zeta Gundam
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 ...then you might like
Kidou Senshi Gundam 00
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While the second season of Gundam 00 is more comparable to Zeta Gundam in terms of plot, it's the first season of Gundam 00 that really captures the feel of Zeta Gundam. The first season of Gundam 00 is very dark like Zeta Gundam, with the the second half of Gundam 00's first season being similarly dark and ruthless like Zeta Gundam's last quarter. And both also end on a cliffhanger, leaving it open to a another season/sequel to complete the story.