I loved Shogun:Total War gameplay and then later on spent weeks re-enacting historical wars and battles with Europa Barbarorum. It's a mod for Rome:TW that focuses on historical accuracy in the peoples, units, sounds, visuals, everything from macro mechanics to actual battles (e.g. a lot more missiles).

Since that time I kind of turned my back on Windows cause it sucks and use Linux cause Mac sucks even worse.

So as I miss that game (Eur. Barb.) and consider it the most realistic RTS to date, I'd like to know if there are any free and open source alternatives to it because ever since I'm under linux, I became addicted to FOSS so I also turned my back on paying (even kickstarters) for closed source, pay to play games.

I have found a clone/alternative for everyone of the best games like Minecraft, CSS, Natural Selection, TA/SupCom etc... It's kind of the last one I need.

The Spring engine is amazing for example, is there another open source project of the source in current development? Or would Spring itself be enough (it certainly looks capable) to make it?

Thanks in advance guys...