Getting Started with Spring Boot 3:

AWS Service registry for resilient mid-tier load balancing and failover.

Apache Ignite

Integration with Netflix OSS components

Library for configuration management API

🔥 HAPI FHIR - Java API for HL7 FHIR Clients and Servers

A Graph Traversal Language (no longer active - see Apache TinkerPop)

Redis-backed non-sticky session store for Apache Tomcat

Google APIs Client Library for Java

Open source analytics and market risk library from OpenGamma

The simplest convenient interface to the Google Cloud Datastore

Ontop is a platform to query relational databases as Virtual RDF Knowledge Graphs using SPARQL

DICOM Archive J2EE application

Vaadin integration for Spring and Spring Boot

Large Graph Layout

DDF Distributed Data Framework - an open source, modular integration framework.

Adapter which transforms DIMSE requests to DICOMweb requests

Wandora is a general purpose information extraction, management and publishing application based on Topic Maps and Java.

Leaner version of jpropel, containing only LINQ, reified collections and utilities for arrays/strings/numerics/files/xml etc.

The Apache Gora open source framework provides an in-memory data model and persistence for big data.

Vitro is a "full stack" framework for building semantic web applications. It is not domain specific.

For more info, check my blog:

A dynamic SQL builder for Java language.

Makes working with OWL ontologies in Java easy by auto-generating classes that wrap OWL instances with a convenient API

CQL parser for Java

visjs vaadin addon

Dashboard builder

SMART COSMOS Objects Framework, Extension API, Java Client, & Maven Archetype