llamafirst writes: Guidewire Software released the Gosu programming language today for public availability. Gosu is a general-purpose programming language built on top of the Java Virtual Machine (JVM). It is object-oriented, static typed, imperative, 100% Java compatible (use/extend Java types, implement Java interfaces, compile to Java bytecode), type inference (very readable code yet static typing!), in-line functions that you can pass as objects (closures / lambda expressions / blocks), enhancements (inject methods + properties, even on Java types!), simplified generics. Gosu has an extensible type system: type loaders dynamically inject types into the language and handle dynamic dispatch. Type loaders dynamically add types from XSDs so XML is easier, and same for consuming remote web services (SOAP WS-I). Guidewire Software's core business is big insurance software and includes Gosu in its products. So, Gosu is new to the public but billion-dollar companies worldwide use Gosu in production for critical systems right now. Gosu is provided via the Apache License v2.0. The language itself is not yet open source, although that is planned for a future community release. Read complete introduction to the Gosu language, compare to other langs, syntax diffs from Java.