Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
Pushbullet - Pushbullet - Your devices working better together
Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.
Pushover - Real-time notifications on your Android, iPhone, iPad, and Desktop
Strikethru - Strikethru is a kind of to-do list notebook for managing work lists and staying updated with the important tasks.
Gotify - a simple self-hosted server for sending and receiving messages