Apache Camel - Apache Camel is a versatile open-source integration framework based on known enterprise integration patterns.
Zapier - Connect the apps you use everyday to automate your work and be more productive. 1000+ apps and easy integrations - get started in minutes.
Azure Service Bus - Learn how to set up messaging that connects applications and services across on-premises and cloud environments. Tutorials, videos, API references, and more.
elastic.io - elastic.io connects your SaaS to other cloud apps in seconds.
Software AG webMethods - Software AG’s webMethods enables you to quickly integrate systems, partners, data, devices and SaaS applications
Skyvia - Free cloud data platform for data integration, backup & management