Sidecar in macOS turns your iPad into a second display, but it's limited to certain Macs and iPads. Thankfully, a few ...

spacedesk is a free app that lets you use an Android tablet as a second display for your Windows PC. Learn how to set up and use it.

This made it perfect for text-based applications, and I found myself propping the tablet up next to my monitor and then firing up split screen mode to keep an eye on my Slack messages, the Pocket ...