Pushover - Real-time notifications on your Android, iPhone, iPad, and Desktop
quippd - quippd is a social news site that anyone can edit.
Pushbullet - Pushbullet - Your devices working better together
Curiyo with My2¢ - Don't just follow people, follow topics
Gotify - a simple self-hosted server for sending and receiving messages
Jobs List - All the jobs from job boards in one place