PushPrime - Supercharge your website with push notifications
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.
Proof - Website conversion rate optimization and visitor monitoring
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
PushCrew - Push Notifications for Websites
Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.