Eclipse GlassFish is an open-source Jakarta EE platform application server project started by Sun Microsystems, then sponsored by Oracle Corporation, and now living at the Eclipse Foundation.
Yes, Eclipse GlassFish is an open-source project made available under the terms of the Eclipse Public License v. 2.0. Find out more in the Eclipse GlassFish NOTICE file.
Yes, the Eclipse GlassFish Project is open for contributions and your help is greatly appreciated. You can report an issue with a bug, feedback, or an enhancement request. You can also contribute code or improve the documentation or the website. Find out more in the Contributing to Eclipse GlassFish page.
Yes, there are multiple companies that provide Enterprise Support and other Professional Services. There’s a list of those companies on the Professional Services and Enterprise Support page.