AirMech

Way back through the mists of time -- 1990 to be precise -- fans of the relatively new RTS genre were treated to what is sometimes retroactively considered to be one of the world's first MOBAs, Herzog Zwei. Players commanded a flying, transforming mech that could both fight and airlift units to different parts of the battlefield. Despite its later cult status, the title didn't perform very well in North America, though it was slightly more successful in Europe, but not enough to stop it from becoming an evolutionary dead end. Until now, that is.

AirMech is very much the child of Herzog Zwei, and its creator has cited the '90s RTS as the main inspiration for this free-to-play mech-focussed MOBA. This spiritual successor is somewhat more welcoming than its predecessor, and is not as micromanagement intensive; It's very much a product of the times, yet it still captures what made the cult classic so compelling over 20 years ago.