Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs.

Apache Flex FlexJS: Compiler: Compiler JX

A Java to TypeScript/JavaScript Open Transpiler

a library to minify CSS and Js sources

Viewer Commons

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Common Servlet/JSP Functionality

Pentaho WebJars Deployer

Build utility with build tools that can also watch the same tasks.

A custom compiler pass that removes extra soy templates.