Our great sponsors
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BetterDisplay
Unlock your displays on your Mac! Flexible HiDPI scaling, XDR/HDR extra brightness, virtual screens, DDC control, extra dimming, PIP/streaming, EDID override and lots more!
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synergy-core
Open source core of Synergy, the cross-platform keyboard and mouse sharing tool (Windows, macOS, Linux)
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
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BetterDummy
Software Dummy Display Adapter for Apple Silicon/Intel Macs to Have Custom HiDPI Resolutions. (by Brezel31)
Not a complete solution, but you should be able to use software like BetterDummy (https://github.com/Brezel31/BetterDummy says you can use most of the features for free) to create a virtual monitor in memory on one. Then you can use VNC or possibly even macOS's Share Screen feature on the other Mac to view the virtual display.
There is also Synergy which used to be open source, that lets you put computers side by side, and when the mouse hits the left edge of one computer, it reappears on the right edge of the adjacent computer, taking the clipboard and keyboard with it.
Not a complete solution, but you should be able to use software like BetterDummy (https://github.com/Brezel31/BetterDummy says you can use most of the features for free) to create a virtual monitor in memory on one. Then you can use VNC or possibly even macOS's Share Screen feature on the other Mac to view the virtual display.