Alternatives to spacedesk for all platforms with any license

Mouse without Borders

Mouse w/o Borders makes you the captain of your computer fleet by allowing you to control up to 4 computers from a single mouse and keyboard.

Free Windows
Mouse Sharing Keyboard Sharing Support for Multiple Monitors Automatic Connection ... Share Clipboard Drag n drop Media button support Mouse Sharing Add a feature

100 Like
ShareMouse

Mouse and Keyboard Sharing to control a Windows or Mac PC with the mouse and keyboard of any other PC.

Commercial Mac Windows
Share Clipboard Sync with Fantastical Keyboard Sharing Mouse Sharing ... Portable Add a feature

80 Like
Input Director

Input Director is a Windows application that lets you control multiple Windows systems using the keyboard/mouse attached to one computer. It is designed for folks who...

Free Personal Windows
Create Macro Gaming-focused Keyboard Sharing Mouse Sharing ... Share your screen Add a feature

66 Like
Barrier

Barrier is a cross-platform software for sharing your mouse and keyboard between multiple computers on your desk. Features include clipboard sharing and SSL encryption....

Free Open Source Mac Windows Linux
Keyboard Sharing Mouse Sharing Share Clipboard SSL encryption ... Preconfigurable auto-connect Add a feature

22 Like
Duet Display

Duet makes your iPad and your Mac more powerful together. Slide Mac apps to your iPad as a second display. No lag, Duet helps you multi-task and work faster with more...

Commercial Mac Windows iPhone iPad
Support for Multiple Monitors Screen Mirroring Tablet Pressure Sensitivity Add a feature

40 Like
x2vnc (win2vnc)

This program will let you use two screens on two different computers as if they were connected to the same computer. The program will open a small (one pixel wide)...
- Discontinued The project is no longer developed but the program is still downloadable and working
Free Open Source Windows Linux
Support for Multiple Monitors VNC Viewer Add a feature

8 Like
iDisplay

Turn your iPad/iPhone or Android tablet or smartphone into a convenient side monitor for your Windows or Mac desktop. iDisplay is a universal app specially optimized for...

Commercial Mac Windows Android iPhone Android Tablet ... iPad
Support for Multiple Monitors Screen Mirroring Share your screen Second monitor support ... USB tether Add a feature

34 Like
Air Display

Use your iPad as a wireless display, to extend your Mac desktop. Ever wish you had an extra display for your computer? There’s an app for that! With Air Display, you can...

Commercial Android iPhone Android Tablet iPad
Screen Mirroring Share your screen Add a feature

17 Like
ZoneScreen

ZoneScreen is able to mirror local desktop to another computer in the network. The main difference is that it also allows extend desktop, not only mirror it. Also, you...
- Discontinued Main web reads "[...] new feature to be implemented, it is very unlikely for new versions to appear in the nearest future[...] I haven't done any changes to ZoneScreen in years." See https://www.zoneos.com/zonescreen.htm
Free Personal Windows Windows Mobile
Share your screen Add a feature

10 Like
Multiplicity

Multiplicity enables a user to control multiple computers with one keyboard and mouse. Multiplicity is installed on networked PCs to create a virtual KVM switch with two...

Commercial Windows
Keyboard Sharing Share Clipboard Mouse Sharing Support for Multiple Monitors ... Remote desktop Remote Support Virtualization Add a feature

10 Like
Win2VNC

This program will let you use two screens on two different computers as if they were connected to the same computer. It even works between different operating systems.
- Discontinued Last Update: 2015-09-23, see https://sourceforge.net/projects/win2vnc/
Free Open Source Windows
Mouse Sharing Add a feature

3 Like
TwomonUSB

Smart devices become monitors by connecting them to a PC via USB! The Convenient Connect TwomonUSB Tablet and computer can be used as a dual monitor easily by...

Commercial $ $ $ Mac Windows Android iPhone iPad
No features added Add a feature

3 Like
across

Across makes a Bluetooth equipped PC or Mac work as a standard Bluetooth keyboard/mouse combo.

Commercial Mac Windows Android
Keyboard Sharing Mouse Sharing Photographic filters Add a feature

3 Like
ShareKM

Control your Droid from your desktop with MOUSE and KEYBOARD. ShareKM is a very handy tool for Android that lets you share your computer's Mouse, Keyboard and...
- Discontinued links are dead
Free Windows Android
Support for Android Things Keyboard Sharing MultiTouch Share your screen Add a feature

4 Like
Splashtop Wired XDisplay

Turn your iPad, Android tablet, Kindle or smartphone into a high performance extra monitor for your computer

Commercial $ $ $ Mac Windows Android iPhone iPad
Support for Multiple Monitors Screen Mirroring Second monitor support Add a feature

3 Like