xbar (the BitBar reboot) lets you put the output from any script/program in your macOS menu bar.
Digging deeper:
And finally...
From an xbar menu, choose Preferences > Plugins... to use the xbar app to discover and manage plugins.
You can browse all the plugins online, or write your own.
The plugin directory is folder on your Mac where the plugins live, located at ~/Library/Application Support/xbar/plugins
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If you'd like to contribute a plugin, head over to https://github.com/matryer/xbar-plugins to get started.
Please do not send pull requests to this repo. Open an issue and start a conversation first. PRs will likely not be accepted.