Gradle is completely open source (ASLv2 license) and is a community driven development effort, led by Gradle Inc.
The Gradle development team uses the Gradle Forums to discuss issues around the development of Gradle itself. This group is open for anyone to join or participate in.
Until September 2014 a mailing list was used for discussing Gradle development.
You can also browse/search the old development mailing list via Nabble
Naturally, Gradle itself builds with Gradle. For instructions on building the project from source, see the
README file in the root of the source tree.
If you are interested in contributing to Gradle, checkout the contributing page that lists ideas that have been identified as good candidates for community contributions.
Gradle has many continuous builds setup for different environments. You can see the builds @ builds.gradle.org.