Games (10000 programs)
Pros: Completely free. More features. Online multiplayer mode. Better usability.
Cons: -.
Pros: Organizes and stores all research in one secure location. Quick and easily adaptable citation and bibliography creation. Supports citation plug-ins for various word processors. 2GB free cloud storage.
Cons: Synchronization with other libraries can be slow. Science based with limited features for arts or humanities.
Pros: Cyber hacking world. Exciting missions. Strategy oriented.
Cons: Weak graphics. Geeks only!.