EssentialPIM - EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and cloud applications.

ChiroTouch - ChiroTouch chiropractic software and EHR is a fully integrated practice management software system with on-premises or cloud options.

Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.

Kareo - Kareo - Go Practice | Medical Office Software for Small Practices

Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.

eClinicalWorks - eClinicalWorks - the largest Cloud EHR in the nation. Make the switch to eClinicalWorks