TargetBridge: Use an iMac as Display for a Modern Mac (github.com)

Use an (old) iMac as an external display for an Apple Silicon Mac — free, no dongle, via Thunderbolt Bridge.

Apple dropped "Target Display Mode" in 2014 with the 5K iMac — and it never came back.

TargetBridge brings it back via software, streaming your screen to the iMac at up to 5K over a direct Thunderbolt cable.

Since v2.0.0, you can now even connect multiple iMacs to get multiple gorgeous 5K displays!

FOSS, under the MIT license.

Disclaimer: I am a project contributor, but not the original author of this project.

Looks Good

That's great! I have a 2015 late iMac 27", and I've already ordered the TB3 to TB2 adapter and TB2 cable. It's not cheap, but it's definitely worth it compared to buying a new monitor!

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Hardware guide:

https://github.com/swellweb/targetBridge/blob/main/docs/Hard...

Would be good if there was a version that runs on linux as that is probably what most of these old machines are running now (mine is)