I know you're looking for a software, but just in case you don't know it:
Blockchain.info does have email and sms alerts for incoming and outgoing payment.
It also has sound alert whenever any of these transactions get confirmed.
So if you just want it to leave a tab open without checking it, blockchain.info can do everything you need.
I actually knew about that, but it never crossed my mind for some reason. This will work better than I wanted.
Thanks a ton!