The API and Issue Tracker for the JCP Standard Java Servlet Specification
Source code for multiple JDK versions(1.6/1.7/1.8/1.9/10/11/12/13/14 JDK's src.zip), Only for learning; "rt_debug.jar" can be used for debugging.
Netty project - an event-driven asynchronous network application framework
AWS Service registry for resilient mid-tier load balancing and failover.