OmniOutliner is not available for Linux but there are plenty of alternatives that runs on Linux with similar functionality. The best Linux alternative is CherryTree, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to OmniOutliner and many of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to OmniOutliner are Workflowy, TreeSheets, Manuskript and Dynalist.
Hierarchical note-taking software that is free, open-source, cross-platform. Features include rich text, syntax highlighting, multi-level lists, embedded files, customizable interface, code execution, PDF export, spell check, images & tables, and comprehensive project management support.
Offers limitless nested lists for outlining, instant sync on web and mobile, real-time collaboration, file and photo uploads, kanban boards, tagging, offline editing, hoisting for branch focus, content sharing, text highlighting, and Dropbox auto-backup.
A "hierarchical spreadsheet" that is a great replacement for spreadsheets, mind mappers, outliners, PIMs, text editors and small databases.
Open-source software offering a hierarchical outliner, distraction-free editor, character management, plot tools, Snowflake method support, section multi-organization, customizable writing workflows, cross-platform availability, and export to standard formats.
Dynalist is a web app that lets you break down and organize your thoughts in the format of lists.
Org mode is for keeping notes, maintaining TODO lists, planning projects, and authoring documents with a fast and effective plain-text system.
wikidPad is a Wiki-like notebook for storing your thoughts, ideas, todo lists, contacts, or anything else you can think of to write down. What makes wikidPad different from other notepad applications is the ease with which you can cross-link your information.
Focus on your words not the interface. Quoll Writer is a writing application that helps you focus on your words. Clean and uncluttered. Feature rich. Features are where you would expect them to be.
Free, open-source writing app for plotters. Import your outline from Scrivener, Plottr, yWriter, or Obsidian — then draft with your scene beats, character notes, and story structure visible alongside your prose. No AI, no subscription, no cloud.
TreeLine just stores almost any kind of information. A tree structure makes it easy to keep things organized. And each node in the tree can contain several fields, forming a mini-database. The output format for each node can be defined, and the output can be shown on the screen...
KeepNote: note-taking and organization. KeepNote is a note taking application that works on Windows, Linux, and
Legend (formerly Moo.do) is a notepad, a to-do list, and an outliner, but with advanced features that make the cloud-based application much more useful than any of those tools would be on their own.
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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.