Amongst the other modules included are entity sensor and laser guns. Combine the two and you've got a pretty nifty little mob defence system right there.

Other items can also be used as modules. Place a clock in a manipulator to find the time of day, use a daylight sensor to get the light level and play a happy working song with a noteblock.

Of course, all Plethora modules have an in-game use too. I'll leave that up to you to discover though.