Engine.IO Server Library for Java
LaunchDarkly Server-Side SDK for Java
Blynk is an Internet of Things Platform aimed to simplify building mobile and web applications for the Internet of Things. Easily connect 400+ hardware models like Arduino, ESP8266, ESP32, Raspberry Pi and similar MCUs and drag-n-drop IOT mobile apps for iOS and Android in 5 minutes
Fake implementation of MongoDB in Java that speaks the wire protocol.
Free and open source log management
Java language server
Breeze support for java servers
Distributed Java game server, including cluster management server, gateway server, hall server, game logic server, background monitoring server and a running web version of fishing. State machine, behavior tree, A* pathfinding, navigation mesh and other AI tools