Orgzly - Outliner for notes, tasks and to-dos
Tkoutline - Tkoutline is a single pane, cross-platform outline editor written in Tcl/Tk .
Notin - Notin – notes in notification app helps users in creating alarms to get reminders about important tasks right on the home screen.
Workflowy - A better way to organize your mind.
Volume Control Panel Pro - Volume Control Panel Pro is an efficient mobile app that enables its users to control the volume of the system conveniently.
Foldout - The single-pane outliner that Windows users have been searching for for years, free!