Here. Cut List is what I use.The middle edition is what I use.
I'd suggest downloading a few trial versions and testing them out to see how intuitive they are to you.
If you've got a graphics program like Photoshop or something, you could use that, as well.
The one I suggest lays out your parts list and optimizes your wood for whatever you want, such as grain, or best use of sheet goods, or whatever. It's really intuitive FOR ME, but I've been using it for a while now. Drop me a PM if you need any help with it, or if you want to just give me your measurements and I'll run 'em through it and send you back the cut list you'll need and the pieces you'll require.