Supreme Commander

Supreme Commander, SupCom in short, is a futuristic real-time strategy game designed by Chris Taylor and released in February 2007.
Supreme Commander is a sequel to the original Total Annihilation.

There is also an open-source version available that's also a sequel to Total Annihilation.
Search the site for "Spring Engine", it has a lot of unique features.

Supreme Commander games are set in the 37th century where 3 forces, named Aeon Illuminate, Cybran Nation and the United Earth Federation battle each other.
Supreme Commander brings some unique features to the RTS genre. For example; it's possible to get a total overview of the map with a extreme zoom function while still being able to control your units on the map.
Also the unit's size variation is unique, some are small but some are on a massive scale.