iNXT Remote: connects to a computer on your network though WiFi. You need a computer running the server program on MAC or PC. You can control it using a virtual joystick, poll sensors, delete and transfer files, run programs, and play sounds.
NXT Drive: requires a jail-broken iPhone – just type your NXT ID in and it connects and controls by tilting the iPhone
iBooks: free app that can read PDFs and you can find instructions or make instructions into PDF form.
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