+1 for the Forte Dxi vsti. Good sounds for a tiny price.
The other way to have good midi sounds is to buy an external soundmodule like the Ketron SD2. It's not the same price but it is really good for acoustic sounds.


Free tools for Biab:
Biab Scales and BIArpeggio to practice scales/arpeggio
Biab Explorer: the other song picker