Free engineering apps?

[Llamarama2011]

Hello everyone, I'm an electrical engineering student and have an Archos 70.

Can anyone suggest any useful apps for electronics? Also, are there any good graphical calculator type programs floating around? Thanks in advance, Llamarama.

 

[AngryHatter]

There are a couple of the Ti scientific calculators floating around in the market.
Navaile Electrical Calculator - electrical wiring app
ElectroDroid - EE calculator