Bored Button - Your gateway out of boredom.
Pushbullet - Pushbullet - Your devices working better together
Kingfisher - Organize and explain just about anything.
Pushover - Real-time notifications on your Android, iPhone, iPad, and Desktop
Crowdcast - CrowdCast provides webinars & virtual conferences.
Gotify - a simple self-hosted server for sending and receiving messages