When you say Nexus, do you mean the tablet? Tested posted a good
list of essential tweaks, which includes app suggestions. I'll be getting one when I can afford it (either mid-August or mid-September, probably).
For the MacBook, a lot of my must-have software is specific to writers and journos — not much use to do. A few gems that might come in handy:
Evernote
ScreenFloat (way more useful than I ever imagined -
I reviewed it)
SyncMate (for backing up your Nexus)
Archy (if you use Google Drive)