Alternatives to Opal for all platforms with any license

Orgzly

Outliner for notes, tasks and to-dos.

Free Open Source Android Android Tablet
Sync with Dropbox To-Do management Add a feature

13 Like
OmniOutliner

OmniOutliner is a start-to-finish writing app. Perfect for collecting information, outlining Big Ideas, adding structure to any sort of writing, and much more. From...

Commercial Mac iPhone iPad
Export to OPML Import feeds from OPML Outline folding Outline organization ... Styles based on outline hierearchy Add a feature

32 Like
OutlineEdit

A beautifully crafted outliner for your Mac: It helps you keep your ideas structured and collected. Use OutlineEdit as an empty canvas to sketch information - for...

Commercial $ $ $ Mac
No features added Add a feature

3 Like
Deep Notes

Deep Notes is a simple hierarchical note pad. You can use it to outline ideas, make to-do lists, or whatever else might need jotting down in a list, hierarchical or not....

Free Mac
No features added Add a feature

1 Like
- Discontinued The application is no longer being supported.