Free Downloads: Java software and Documentation. Check packages for license and distribution information. JRVN The premiere relational visualization toolkit. Tightwire Our quick, safe and robust Java TCP/IP toolkit for creating secure low-level client-server applications. Illumina Create complex, interactive visualizations by utilizing our on-the-fly technology for dynamically exploring relational(JDBC) data. Semaphore Our thread control semaphores for Java, with advanced methods for ensuring queue order, timed waits and interruptible waits. EZ-TCP/IP The easy to use wrapper for TCP/IP custom protocols that enables message-passing client/server apps to be quickly developed. It includes synchronous and asynchronous messages, message reply timeouts, automatic connection failure detection and many other first-rate features.