Which terminal window app allows for multiple panes and click to open new window
Solution 1:
Acme in Plan9.
There's a macOS version available.
If you want this video Ori actually talks through and explains how to change and edit how the editor behaves: Plan 9: Not dead, Just Resting, by Ori Bernstein
Solution 2:
Like mentioned in my comment (now deleted) this is plan9 running acme:
The implementation of plan9 actually used in the video is: Plan 9 from User Space
It has to be installed/compiled with Xcode:
Installation
To install, run ./INSTALL. It builds mk and then uses mk to run the rest of the installation.
For more details, see install(1), at install.txt in this directory and at https://9fans.github.io/plan9port/man/man1/install.html.
Requirements/Recomendations:
- Xcode 10.1 for High SIerra
- Xcode 11.3 for Mojave (at time of writing)
- the source: https://github.com/9fans/plan9port/archive/master.zip
Example:
Successfully compiled/installed in High Sierra (see screenshot) and Mojave. Not tested in Catalina.