The first one is a radio that will allow you to connect to another computer or router. While it can be done, running an Arduino web browser won't be very efficient. Especially when the browser you are using right now does it so well.
The second one lets you control a motor or motors (depending on type), but as jremmington said, it does not include the motors. Fine if you want to play around with different motors, but most people decide on a motor/driver combination so the work together.
The third one sounds fun. You could make a hearbeat monitor for an exercise machine, or a diy fitbit.