barbly VS SwiftBar

I've been using barbly[0] which I wrote to scratch my own itch. It uses a JSON format for describing the menu bars which I found easier to work with. It's aesthetic is slightly different as well.

[0] https://github.com/luke-clifton/barbly

I don't know if this supports your use case, but look into SwiftBar. https://github.com/swiftbar/SwiftBar

I’m in a similar boat. Only one external monitor on an M1 Studio. Every time I restart, GeekTool cannot find the monitor, so I have to manually move all 10 of my geeklets to the main monitor. I looked into moving them via script, but was unsuccessful because the monitor id was inexplicably not identical on geektool’s side between launches (I gather this is a known issue from the developer). Sadly, I have been unable to find an app that sufficiently replicates GeekTools functionality. That being said, I have moved some of my scripts to SwiftBar where they are accessible via the menu bar instead of displayed on the desktop. Works fine for simple text stuff, but not my more graphical calendar. I’m saving this post though, because I still want a true fix/replacement for GeekTool.

https://github.com/swiftbar/SwiftBar - Powerful macOS menu bar customization tool

As many of you, I obsess over the current metrics of my TMHI modem. Opening the app to check it is too cumbersome. On MacOS there is a cool free utility that allows simple scripts to run in the menu called SwiftBar (get it here: https://github.com/swiftbar/SwiftBar )

Maybe swiftbar?

I am sure you could create a stock ticker with SwiftBar https://swiftbar.app. SwiftBar has plugins which write to the menubar using shell scripts. And there are already some stock ticker plugins - I am sure you could modify one of them to meet your needs.