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.

Pusher Beams - Send push notifications programmatically at scale

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

Notisave - Notisave – Status and Notifications Saver is an exceptional tool created and published by Tenqube Inc.

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

Notifiee - Send cross-channel team notifications from your app ⚡️