Amazon SNS - Fully managed pub/sub messaging for microservices, distributed systems, and serverless applications
Pushbullet - Pushbullet - Your devices working better together
Gotify - a simple self-hosted server for sending and receiving messages
Pushover - Real-time notifications on your Android, iPhone, iPad, and Desktop
Minify - Minify is an online CSS and JavaScript minifier.
AirMore - AirMore is a cross-platform toolset that can help you manage any Android device wirelessly.