Dune Legacy

Dune Legacy is a Free remake of the classic (perhaps the first?) RTS Dune II. It tries to be similar to the original while adding modern features, such as the ability to select many units at the same time and support for higher display resolutions. It also has three single-player campaigns, multiplayer support, a map editor and some nice scaling that makes the classic 2D graphics look sharp and high-res even on modern displays. You will need the original data-files, but if you have those this could be a really fun and well-made RTS.

A base in ruins and lots of tanks from Dune Legacy.