OneNote - Get the OneNote app for free on your tablet, phone, and computer, so you can capture your ideas and to-do lists in one place wherever you are. Or try OneNote with Office for free.
C-Organizer - C-Organizer is a robust software tool designed for the professional manager that permits them to organize business activities altogether.
CherryTree - A hierarchical note taking application, featuring rich text and syntax highlighting, storing data in a single xml or sqlite file.
Info Select - Info Select is a Personal Information Manager that organizes Internet data, notes, to-do's...
RightNote - Advanced notes and information manager for Windows
AllMyNotes Organizer - AllMyNotes Organizer is a multi-functional hierarchical information manager for Windows.