Personal Information Managers

Combines a calendar and information manager to plan projects.
Notesbrowser is a helpful, fast-access free organizer software and free to do list software for making and storing quick notes. It also is a visual organizer for scheduling dates and set alarms & reminders. What makes Notesbrowser unique is its smart integration of all features and its visual look
https://www.notesbrowser.com/
Open Source Applications Foundation - Welcome
Computers, Software, Freeware, Personal Information Managers - ChandlerProject. An open source PIM intended for use in everyday information and communication tasks, such as composing and reading email, managing an appointment calendar and keeping a contact list.
http://www.osafoundation.org
MiniReminder
Computers, Software, Freeware, Personal Information Managers - MiniReminder. Small and simple Windows application to remind yourself of important yearly events like birthdays, anniversaries, renewals.
http://www.minireminder.com
A web based planning and organizing system for end users.
SourceForge presents the DailyPlanner project. DailyPlanner is an open source application. SourceForge provides the world's largest selection of Open Source Software. A web based planner to track a person's daily tasks. Includes many features
https://dailyplanner.sourceforge.net/