Very good "Xcom" Tribute.

Before the IOS port Release of Xcom
This was THE only Xcom type game available in the App Store.

Loving crafted by a two person Husband-Wife team, this games only real shortcoming is the lack of attention its received. Having been regularly updated with content for over two years so far, AvH is a true gem for anyone who loves classic Xcom.

Boomwolf about Aliens versus Humans