Battle of Empires: 1914-1918 is a pretty good looking real time strategy game from Great War Team and Publisher Best Way Soft. It has now managed to find its way onto Linux.
It seems certain users aren't happy with DLC campaigns believing they should have gotten it free. The developers put up their response to this here.
Their open communication is good, and I actually understand the developers side on this one. You shouldn't expect DLC for free even if you purchased a game in Early Access. I hope people won't be put off too much by the negative reviews based on it, as it does look like it might be a pretty good RTS.
About the game
Battle of Empires :1914-1918 is a story driven RTS, that re-lives some of the bloodiest battles of “The Great War”. The missions include some of the most fearsome weaponary employed of the period. Sabotage, stealth, trench warfare, gas attacks, artillery and mobile infantry - BoE has it all!
The first campaign of the series - Battle of Empires: France - is devoted to the battles between the French and German armies on the Western Front.
The second campaign- Battle of Empires: Russian Empire - is devoted to the battles between the Russian and German armies on the Eastern front. Both of these campaigns are included in the base game.
Gameplay is similar to other Men of War based titles, with the ability to control your men, at divisional, squad and soldier levels.