emitter.io - Real-time communication service for connecting online devices.
Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies
OneSignal - Customer engagement platform used by over 1 million developers and marketers; the fastest and most reliable way to send mobile and web push notifications, in-app messages, emails, and SMS.
Microsoft IIS - Internet Information Services is a web server for Microsoft Windows
NATS - NATS.io is an open source messaging system for cloud native applications, IoT messaging, Edge, and microservices architectures.
LiteSpeed Web Server - LiteSpeed Web Server (LSWS) is a high-performance Apache drop-in replacement.