Reference to:
Where to start for RTS games?
Making RTS games,and etc.
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3D
Glest
Glest is a 3D real-time strategy game. Fully customizable using XML and a set of tools.（SF）
My compile steps is here
TA Spring
an open source project developing a new realtime strategy game.
Here is the detail.
The screen shots are great!
Here is the chinese players froum.
warzone2100
http://wz2100.net/home
3d rts game.
My compile steps is here
2D
dark oberon
http://dark-oberon.sourceforge.net/?page=documentation
2D rts game base on glew.The lastest version is 1.0.2. Easy to compile in vc6.
Stratagus
Stratagus comes from FreeCraft ( see here )
A free 3D RTS engine used by several games. The developers of Stratagus are working on Boswar(2D), which is an open source RTS game using Startagus.
machinations
http://machinations.sourceforge.net/index.php
http://www.machrts.com/
It was made using GLFW, a framework for OpenGL. it's an open-source rts using openGl. with that, tutorials, and practice, you should get yours to work .
i had port machinations v0.34 from Borland IDE to VC2005,see here
ORTS
a RTS engine
RTS Starter Kit (Indie License)
Torque Game Engine
The only RTS maker that exists is the RTS Starter Kit (Indie License) to be used with the Torque Game Engine. It will cost a total of $100(engine) + $50(addon) though.
OpenRTS
OpenRTS is an open source realtime strategy game.Written in Python.
WIKI :
OpenRTS
TA_Spring
编译运行了某些游戏，发现：
3D方面Glest, TA spring, warzone2100的效果不错.
2D方面dark oberon似乎不错，毕竟版本已经1.0以上了。
网络上对Bos war的引擎评价似乎不错。
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个人愚见：其实 0 A.D.不错