JRebel
JRebel, formerly known as JavaRebel, is a plug-in for the Java Virtual Machine (JVM) that enables instant reloading of changes made to a Java class file. JRebel was developed by Jevgeni Kabanov and Toomas Römer who went on to found ZeroTurnaround, a software company based in Tartu, Estonia. In June 2011, JRebel was recognized as "Most Innovative Java Technology" by the JAX Innovation Awards. At JavaOne / Oracle Develop 2011 in San Francisco, JRebel was awarded the Duke's Choice Award for "Innovative Compiler for Java Code".
Read more about Jrebel.