TreeSheets combines spreadsheet tools, mind mappers, outliners, personal information managers, text editors and small database utilities into an all-in-one office application.
Evernote is a note management application that offers you a single place for the organization, easy input and quick retrieval of all types of notes and clippings.
CalendarTask (formerly DesktopCal Desktop Calendar) helps you manage appointments, to-do lists, schedules, and more without blocking access to your desktop icons.
ToDoList is a versatile task management tool that allows you to break down complex projects into manageable parts by repeatedly subdividing them, creating a hierarchy of simpler subtasks.
VOVSOFT Tree Notes is an application for taking hierarchical notes designed to improve organizational efficiency and streamline information management.