The best open source alternative to CarbonFin Outliner is Orgzly. If that doesn't suit you, our users have ranked more than 10 alternatives to CarbonFin Outliner and three of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to CarbonFin Outliner are Orgzly Revived and Zavala.
You can keep notebooks stored in plain-text and have them synchronized with a directory on your mobile device, SD card, Dropbox, or over WebDAV.
Zavala is a modern take on a traditional outliner. It supports all the things you want in a Mac app like multiple windows, keyboard shortcuts, a customizable toolbar, and a full menu bar.
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