OpenXava
Grails
Vaadin Framework
CUBA.platform
Eclipse RAP
Open As App
AppFlower
Apache Sling
SourceForge
GitHub
GitLab
BitBucket
openDesktop.org
Gitea
Launchpad.net
OSOR
OpenXava is recommended for small to medium enterprises, independent developers, and consultants who need to create web-based business applications quickly. It is particularly useful for those familiar with or willing to leverage Java and looking for a framework that reduces the manual effort involved in interface and CRUD operations creation.
Grails - An Open Source, full stack, web application framework for the JVM
GitHub - Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.
Vaadin Framework - Vaadin is a web application framework for Rich Internet Applications (RIA).
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
CUBA.platform - A Full Stack Enterprise Java Framework with lots of out of the box functionality and amazing...
BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.