Open source alternative to Auth0 / Firebase Auth / AWS Cognito

Change data capture for a variety of databases. Please log issues at https://github.com/debezium/dbz/issues.

JanusGraph: an open-source, distributed graph database

OpenPDF is an open-source Java library for creating, editing, rendering, and encrypting PDF documents, as well as generating PDFs from HTML. It is licensed under the LGPL and MPL.

Real-time transport layer for Java AI agents. Build once with @Agent — deliver over WebSocket, SSE, gRPC, and WebTransport/HTTP3. Talk MCP, A2A and AG-UI.

A graph database that supports more than 100+ billion data, high performance and scalability (Include OLTP Engine & REST-API & Backends)

A Graph Traversal Language (no longer active - see Apache TinkerPop)

A large-scale entity and relation database supporting aggregation of properties

Java Indexed Record Chronicle

A flexible, partial, out-of-order and real-time typeahead search library

The Amazon DynamoDB Storage Backend for JanusGraph

Track data flowing through Java programs

Postgresql To Kinesis For Java

a library for constructing geometric data

Modern Dependency Management

A temporal graph database on top of Datomic

An RDF TripleStore in Java