1. Use as a monitor
Look for a preinstalled "TV Remote" app to tap, or download one of the many free third party apps that can do the same thing.
2. Scanner on the go
Try the Handy Scanner Free app for Android, it has optical character recognition, so it makes the text editable and searchable.
3. Access home pc remotely
Try free apps such as Splashtop Remote Desktop to log in securely and remotely.
4. Use as a second monitor
Try Avatron's Air Display to turn your tablet into a wireless display for your PC.
5. Use as a phone
There are many free apps, such as ePhone, magicJack, NetTalk, Viber and others, that can enable you to make free VoIP calls.