Talend is one of the largest pure play vendors of Open Source software, offering a breadth of middleware solutions that address both data management and application integration needs.
Talend lets organizations unlock all of their data, including historical, live, and emerging data. Through native support of the modern big data platforms, Talend’s zero footprint solution takes the complexity out of integration and equips IT to be more responsive to the demands of the business, at a predictable cost.
We've been working with them since 2009, and use it in a multitude of situations like data migrations or ETL projects.
For more info checkout https://www.talend.com