Two things:
Chamberlain belt drive door openers -- they can be set to close automatically after 1,5,10 minutes (IIRC). Great way to ensure that the door is closed. Motion sensor lights. The system also has a battery backup to allow limited operation during power failures. The system *can* be controlled by smartphone app...but I chose not to enable that. I don't really need to do that, I don't need Chamberlain knowing when I operate the door, and I'm concerned about the security issue (someone else accessing the door).
Bluetooth adapter for my garage stereo - Logitech 980-000910 Bluetooth Audio Adapter plugs into the aux (or tape) port of any standard stereo receiver and allows me to broadcast anything from my smartphone -- streaming music, podcasts, etc. Radio reception in our neck of the woods is marginal at times, so this gives me a lot more flexibility in entertainment while I'm in the garage.
Oh, and one other item -- Ross Tech software on my laptop (or tablet), Ross Tech OBDII cable, allows me to run pretty extensive diagnostics and configuration settings on my fleet of VAG cars (Audi, VW). I picked up a cheap ($75) HP tablet for this, but the lack of a real keyboard makes the software more difficult to use. The Ross Tech software is a free download, runs on Windows PC/tablet and on VMWare Fusion on my Mac, the cable has the licensing. I bought a cable over 15 years ago, have used it on all my (VAG) cars since then.