OpenXava - OpenXava is a Web Java Framework for Rapid Development of Enterprise Applications.
Spacewolff - P2P marketplace for ads. Turn excess space into ad space.
jHipster - JHipster is a development platform to quickly generate, develop, & deploy modern web applications & microservice architectures.
Wrapify - Connecting drivers + brands to create on-vehicle advertising
Spring Framework - The Spring Framework provides a comprehensive programming and configuration model for modern Java-based enterprise applications - on any kind of deployment platform.
Grabb-It - Location-based ads on your Uber's window