Janino is a compiler that reads a Java expression, block, or source file, and generates Java bytecode that is loaded and executed directly. It is not intended to be a development tool, but an embedded compiler for run-time compilation purposes, such as expression evaluators or "server pages" engines like JSP.

Excelsior JET is a complete solution for acceleration, protection and deployment of your Java(tm) applications, certified Java Compatible on a number of Microsoft Windows and Linux (IA-32) platforms.

Excelsior JET Optimizer converts your application's classes and jars into a highly optimized native executable.

Excelsior JET Runtime is a complete JVM that works with both Java classes and the executables produced by the Optimizer.