OmniOutliner Alternatives for Windows
OmniOutliner is not available for Windows but there are plenty of alternatives that runs on Windows with similar functionality. The most popular Windows alternative is 
Notion, which is free. If that doesn't suit you, our users have ranked more than 50 alternatives to OmniOutliner and many of them are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to OmniOutliner are 
CherryTree (Free, Open Source), 
Dynalist (Freemium), 
Manuskript (Free, Open Source) and 
Org mode (Free, Open Source).
- With so many tools, it's hard to keep everyone on the same page. Notion is a new tool that unifies them all. View 291 alternatives to Notion
- Freemium
- Mac
- Windows
- Online
- Android
- iPhone
- Android Tablet
- iPad
- Software as a Service (SaaS)
Notion is great, but it's not specifically an outlining tool. - A hierarchical note taking application, featuring rich text and syntax highlighting, storing data in a single xml or sqlite file. View 467 alternatives to CherryTree
- Free • Open Source
- Windows
- Linux
- PortableApps.com
The thing I love about OmniOutliner is the fact that each row of data in the hierarchy can have multiple columns, which is very convenient UI for structured data. CherryTree doesn't support this. - Dynalist is a web app that lets you break down and organize your thoughts in the format of lists. View 72 alternatives to Dynalist
- Freemium
- Mac
- Windows
- Linux
- Online
- Android
- iPhone
It's really intuitive to use and generates beautiful lists. I just needed collapsible lists, but now there's a lot more I can do with lists. - Open-source tool for writers. With outliner, character management, plot development, distraction-free editor, etc. View 95 alternatives to Manuskript
- Org mode is for keeping notes, maintaining TODO lists, planning projects, and authoring documents with a fast and effective plain-text system. View 231 alternatives to Org mode
- Free • Open Source
- Mac
- Windows
- Linux
- GNU Emacs
Orgmode is not tailored to writing but more to organizing. - wikidPad is a Wiki-like notebook for storing your thoughts, ideas, todo lists, contacts, or anything else you can think of to write down. View 231 alternatives to wikidPad
Discontinued
Last update was in November 2018, and various links are dead on their website.
- Free • Open Source
- Mac
- Windows
- Linux
- BSD
- MyLifeOrganized (MLO) is a personal task outliner and to-do list manager which will help you to organize your goals, projects and tasks into a tree. View 200 alternatives to MyLifeOrganized
- Freemium
- Windows
- Android
- iPhone
- Android Tablet
- iPad
- Apple Watch
- Memento is a personal database that allows you to store all personal data in one place. Collections, purchases, inventory, recipes, tasks – let Memento handle all that. View 55 alternatives to MementoNo screenshots yet
- Freemium
- Windows
- Android
- Java
- Working on a project, researching a topic or writing an article? Walling makes it easy to break down your ideas, refine them and visually organize them. View 254 alternatives to Walling
- A new medium for your ideas—augment your thinking with a text editor designed for structuring lists. Side-by-side views allow 3 modes of thinking. View 255 alternatives to Indigrid