pure java git solution
     Gitblit
                 
            
                
                
                An in-memory file system for Java 7+
                 
            
                
                
                Elegant parsing in Java and Scala - lightweight, easy-to-use, powerful.
     Home · sirthias/parboiled Wiki · GitHub parboiled - elegant parsing in java and scala - lightweight, easy-to-use, powerful.
                 
            
                
            
                
                
                A complete 3D game development suite written purely in Java.
     jMonkeyEngine - 3D Game Development for Java developersjMonkeyEngine | 3D Game Development for Java developers 3d game development for java developers
                 
            
                
            
                
                
                Catch common Java mistakes as compile-time errors
                 
            
                
                
                Socket.IO Client Implementation in Java
                 
            
                
                
                Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard. By default it supports the Google Java Style Guide and Sun Code Conventions, but is highly configurable. It can be invoked with an ANT task and a command line program.
     checkstyle – Checkstyle 6.12.1
                 
            
                
                
                Redisson - distributed and scalable Java data structures (BitSet, Set, ScoredSortedSet, SortedSet, Map, ConcurrentMap, List, Queue, BlockingQueue, Deque, Lock, AtomicLong, CountDownLatch, Publish / Subscribe, HyperLogLog, Redis pipelining) on top of Redis server. Based on own high-performance async and lock-free Java Redis client