Google Calendar - Spend less time managing your day & more time enjoying it
C-Organizer - C-Organizer is a robust software tool designed for the professional manager that permits them to organize business activities altogether.
CalenGoo - Features | 1.0.175 for Android™
MSD Organizer - MSD Organizer one of the best software providing you a personalized experience with the complete visibility of the personal and professional manager.
Jorte - Schedule books must be practical and has a good design.
AllMyNotes Organizer - AllMyNotes Organizer is a multi-functional hierarchical information manager for Windows.