Open-source, low-code, extendable API integration & workflow automation platform. Integrate your organizations or your SaaS product with any third party API

The Frank!Framework is an easy-to-use, stateless integration framework which allows (transactional) messages to be modified and exchanged between different systems.

Convert JSON from document-oriented DB to neo4j graph

Neo4j - Couchbase Connection API

A simple orchestration library for running complex processes or workflows in Java with visualization

AppNet is the next web service integration protocol. It connects web applications in an Android-like way and web services of any framework/protocol by a service broker system using OAuth2 based authorization. This is a speciifcation

Apache Camel is an open source integration framework that empowers you to quickly and easily integrate various systems consuming or producing data.