Apache Camel - Apache Camel is a versatile open-source integration framework based on known enterprise integration patterns.
WSO2 Enterprise Service Bus - WSO2 ESB enables enterprises to be more agile in delivering new digital products and services, both internally as well as across digital ecosystems.
Apigee - Intelligent and complete API platform
Software AG webMethods - Software AG’s webMethods enables you to quickly integrate systems, partners, data, devices and SaaS applications
Camunda - The Universal Process Orchestrator
Oracle SOA Suite - SOA Suite