I have a 16gb iPad 2. Most of the space is taken up by games and it's hard figuring out what games I want to remove to open up space. Is there a way to transfer the games wirelessly to an external hard drive? I know on Android, you can transfer games to a micro sd card. Not sure if it's possible on an iOS device.
No, unless the device is jailbroken. Without jailbreaking, the applications can't be transferred elsewhere and remain useable.
You can use iFunbox to backup your data to your mac/pc.
Note: This does not transfer your data.
If you want to transfer your data too, select everything and and save it to your mac/pc
Next, when you want to use the app, re install it through iFunbox, delete the old content and copy the data you saved to your mac back into the file in your mac.
(This is a very troublesome and long method)
A alternative is iUSBport by hyper, but I don't have it and am not sure if it works.