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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 lists, scheduling tasks and reminding events.
                    
                    
                    Main features
- Hierarchical storage of text items.
 - Each item can be associated with multiple event rules, supporting events or tasks with complex recurrences.
 - Times can be set in either local or UTC time.
 - Highlight unallocated time or overlapping events.
 - Schedule views can be exported to plain text for usage on other devices.
 - Tray icon and notifications for alarms.
 - Clean interface based on tiling and tabbing rather than floating dialogs. Possibility to set the menu bar to autohide.
 - Extensive keyboard access with fully configurable global and contextual shortcuts.
 - Highly customizable through a single plain-text configuration file.
 - Addons can be enabled or disabled as needed.
 
Resources
- Take a look at some screenshots.
 - Read the installation instructions.
 - Follow the feature tour to take the first steps.
 - Star and watch the project on GitHub and SourceForge.
 - Browse the wiki for more useful information.
 - Ask a question or share your thoughts in one of the various support channels, like the forum or the mailing list.
 - See some ideas for contributing.
 - Report bugs or request new features.
 - Finally, some due acknowledgements.
 
Latest release: 0.8.4 (2018-02-04)