As a developer, I spend most of my day on my MacBook Pro. Unfortunately when I am out and about, I really notice the lack of screen real-estate, especially when I am doing web development or working in XCode. I have started using my iPad as a second monitor, using the “Duet Display” software. The iPad app is about £10 on the AppStore, and the Mac Software is a free download. You need to use a USB to Lightning cable to connect the iPad to the MacBook, which makes for a nice and fast display. It also means that I carry around a little stand for my iPad. The setup works well though, and makes a big difference to my development productivity when I’m on the road.