Maxis and EA have released a SimCity Free Trial on the Origin distribution service (Under Games and Demos in the Origin client). The Trial gives you access to 4 hours of the games Single Player mode, the timer starting when you first run the game after installing but doesn’t pause should you take a break.The Trial, like the game, comes in at just over 2GB download but requires 12GB of HDD space allowing for disc swap and unpacking space for the city simulation game.
The Free Trial appears to be only for Windows machines with no Free Trial equivalent currently showing in Origin for Mac users.
Grab the Free Trial from http://www.simcity.com/free-trial. We have also confirmed that at least some of the mods made for the game work in the Free Trial.