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As an Acme user, I find the extensibility feature very interesting: Once you are used to Acme's contextual (and programmable) handling of text, it's hard to go back to a normal terminal.

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Never heard of Acme -- can you elaborate?

It was an editor for Plan9.

Here you go: https://en.wikipedia.org/wiki/Acme_(text_editor)

It still is.

It also runs on Macos, Linux, Windows, and BSD.

Thanks...followed the Wikipedia link to the Rob Cox demo video. Mind blowing to have an editor as an OS filesystem that can intercept OS events. If I hadn't spent the last 20 years learning vi I would grab a copy and give it a try.

Russ Cox, not Rob Cox. You may be intermingling Rob Pike and Russ Cox, who are both involved in Acme.

Yeah, plan 9 did a lot of cool things and fixed many of Unix fundamental warts. Taking the "everything is a file" much further, and namespaces as a fundamental primitive rather than something bolted on afterwards, for starters.

Alas, too little too late, it seems.

Inferno and Limbo improved upon it.

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