atrocore

AtroCore is an enterprise-ready, highly configurable, and scalable open-source Data Management and System Integration Platform. It can be used for Master Data Management (MDM), Product Information Management (PIM), Business Process Management (BPM), and much more. Maintained by atrocore on GitHub, where it has earned 225 stars from the community.

It's actively developed around api-first, application-development, b2b, and is a solid reference for anyone building with these tools.