Google Nexus 7

This should really go without saying, given that it's called the ​Nexus​ 7, but we'll go ahead and say it anyway. Yes, you can unlock the Nexus 7 bootloader, then have your way with it however you deem fit.

Unlocking the Nexus 7 is the same as any other Nexus device. You'll need to put it into USB debugging mode, have the Android SDK installed on your computer, and then use the ​fastboot oem unlock​ command. (Relocking is just as easy, too.)

So, no worries on that front.

Also: See our hands-on with the Nexus 7