Groovy++, the static typing compiler extension for Groovy, is to be released as open source under the APL2. The Groovy++ project started last year and at the time Alex Tkachman, project founder said Groovy++'s compiler "uses several pieces of technology, which our company uses and plans to use in our commercial products. It was not critical when project started as experiment, but now we need to extract these parts and replace/rewrite them with proper open-source alternatives".