Top Alternatives to OmniOutliner

WorkFlowy is an organizational tool that makes life easier. It's a surprisingly powerful way to take notes, make lists, collaborate, brainstorm, plan.

wikidPad different from other notepad applications is the ease with which you can cross-link your information.

CherryTree is an hierarchical note taking application, featuring rich text and syntax highlighting, storing data in a single xml or sqlite file.

NixNote is an open source client for Evernote.

MyLifeOrganized (MLO) is the most flexible and powerful task management software for getting your to-dos finally done.

KeepNote is a note-taking and organization. KeepNote is a note taking application that works on Windows, Linux, and MacOS X.

Org-mode is an Emacs Mode for Notes, Planning, and Authoring.

EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries, etc.

Piggydb is an open source Web notebook application that provides you with a platform to build your knowledge personally or collaboratively.

Checkvist helps you create and share online outlines, project plans, online checklists, and task lists.

UV Outliner is a single pane outliner with multicolumn support.

Moo.do brings all of your tasks together into one consistent interface.

Dynalist lets you organize your ideas and tasks in simple lists.

germ lets your team capture every great idea, brainstorm and turn them into actionable project plans.

Manuskript is an open-source tool for writers.

Quoll Writer is a writing application that helps you focus on your words.

Goalton.com is a platform for goal and task management.