Apache NiFi is the first open source one. https://www.nsa.gov/public_info/press_room/2014/nifi_announcement.shtml https://www.nsa.gov/public_info/press_room/201

Apache NiFi is the first open source one. https://www.nsa.gov/public_info/press_room/2014/nifi_announcement.shtml https://www.nsa.gov/public_info/press_room/2014/nifi_announc... Joe Witt is a smart guy who put a lot of work into making a robust workflow tool there.