Apache Nifi is an easy to use, powerful, and reliable system to process and distribute data. It supports powerful and scalable directed graphs of data routing, transformation, and system mediation logic.
Basically, it's a highly configurable way to make sure data gets from A to B and/or C etc. while maintaining transparency, logging, and simplifying the design and maintenance of each step along the way. It'd be a great complement to existing apps/services to allow management and ingest to Cloudron apps of external data sources, moving/copying data between apps, etc. (though to be fair, the learning curve is steep - not quite a brick wall, but a bit of a mountain, to get at its power).
Already dockerized, can do LDAP SSO, and it's a full-on ASF project, so there's some staying power implied there.