spacedesk is described as «The multi-monitor display extension app, spacedesk lets you use other devices and computers on your LAN (Local Area Network) as monitors for your Windows desktop. At least 2 machines are needed to operate spacedesk» and is a popular screen mirroring app in the os & utilities category. There are more than 10 alternatives to spacedesk for a variety of platforms, including Windows, Mac, Android, iPhone and iPad. The best alternative is Deskreen, which is both free and Open Source. Other great apps like spacedesk are Duet Display, Multiplicity, Air Display and Weylus.spacedesk alternatives are mainly Screen Mirroring Apps but may also be Mouse Sharing Utilities or Keyboard Sharing Utilities. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of spacedesk.