Hi i'm looking for any free strategy games but I do prefer Real-Time. I have League of Legends and didn't like Battle Forge. Also i'm running windows seven so I can't get the free command and conquer game's F-U Kane. 
(One last thing is i'm running a 128mb integrated graphics card so nothing to graphics heavy my Company of Heroes Benchmark on Medium-Low settings is around 25fps)

If you like League Of Legends, I think Heroes of Newerth just went into open beta.

It's not real-time, but eRepublik is a whole lot of fun, as long as you join up with others.

if you like league of legends you should give heroes of newerth a try... as said above, it just entered open beta status so it's going to be free for some time...  
 
apart from that i can't really think of anything free

You could try Warzone 2100, it was a commercial game but they released it for free (open source too?) you can get it here:

http://wz2100.net/

Heroes is Neworth is pretty fun but i'm looking for something more like supreme commander or command and conquer (Sorry if I seem kinda bitchy) 

 http://www.kongregate.com/games/tjcarlos/civilizations-wars
 
Have fun, you can spend like 50 hours on that