Mender is an open-source (Apache 2.0) project to address over-the-air (OTA) software update management for Linux-based IoT devices. When we researched this five years ago, there were no open-source end-to-end (device-to-server) options to manage the lifecycle of OTA updates for connected devices. Some open-source options were available, but they either had a proprietary management server, or they were client-only and required integration with another back-end server.