Opal lets you organize just about anything — ideas, reports, lists, notes, projects, graphics — in the form of an outline. If you used Acta, you’ll love Opal.
Cost / License
- Paid
- Proprietary
Platforms
- Mac




OmniOutliner is described as 'Start-to-finish writing app. Perfect for collecting information, outlining Big Ideas, adding structure to any sort of writing, and much more. From grocery lists to email drafts to long-form composition' and is a Note-taking tool in the office & productivity category. There are more than 50 alternatives to OmniOutliner for a variety of platforms, including Windows, Mac, Linux, Web-based and iPhone apps. The best OmniOutliner alternative is CherryTree, which is both free and Open Source. Other great apps like OmniOutliner are TreeSheets, Workflowy, Manuskript and Dynalist.
Opal lets you organize just about anything — ideas, reports, lists, notes, projects, graphics — in the form of an outline. If you used Acta, you’ll love Opal.




Noteship is a personal information manager that combines notes, todos, and reminders and is based on simple files and folders.






Dashword is by far the most convenient and user-friendly tool for creating any semantic network, be it your business idea, an abstract of a lecture on computer science, a script for a movie or a recipe for your favorite dish.




Great application for creating lists and outlines that need to be accessible anywhere, good for reoccurring shopping lists or check lists / notes on how to do a complicated or seldom used procedure. Can also view and use a check list or outline from the easy web interface!
Perfect personal productivity tool 🙀 Never lose your data again and store your notes, links, files, and a lot more. The whole infrastructure is designed to help an advanced user to be in a good shape with data.




CrossLine is an outliner with sophisticated cross-link capabilities in the tradition of the well-respected Ecco Pro. It implements the concept of "Transclusion" proposed by Ted Nelson and - among others - implemented in the legendary Objectory SE tool by Ivar Jacobson.

The product offers three primary types of views — phone book views, calendar views, and notepad views. Central to the program's design is an outlining structure and the ability to easily manipulate information regardless of in which view it was entered.

Tkoutline is a single pane, cross-platform outline editor written in Tcl/Tk . With this editor, information can be structured hierarchically in an outline and outlines can be hyperlinked together to create a web of outlines.

Outspline is a free and open-source modular outliner whose functionality can be extended with addons. The most important addon is Organism, which adds advanced time management features and turns the application into a personal organizer, perfectly suited for working with todo...




Taskfabric is the task manager built for you and your team! Use it on all your devices and desktop platforms, in your web browser and more.




Capture, organize, and work with ideas easily. Speare's intuitive and flexible side-by-side writing interface makes content creation a breeze.

