Monitor Mode Debug

I asked this a while back on the old Keil forum, but got no reply.

So perhaps the Cortex-M experts can help?

Segger support Monitor-Mode Debug (as opposed to Halting Debug) for Cortex-M using their J-Link:

I have used it with Nordic devices - where it is invaluable for application debugging while the BLE stack is running:

However, as far as I can find, Segger is the only one to have an implementation that uses it.

So the question is: Is anyone aware of any other implementation?

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