Hermes: An open-source document management system
I read through the project as I worked with several document storage solution before and still lookin for an ideal solution. 
Filenet is horribly overpriced from IBM, 
Alfresco looks nice but have serious performance issues (my experience is from 2020), SharePoint is only nice if everything is Microsoft... Apache Oak is an abandoned project with a lot of things that seems to be in it but didnt get finished (e.g. CMIS protocol or usable documentation).This Hermes seems nice and being open source is a great thing but it's still in alpha, do not support custom file types and very Google oriented.If anyone has a good mature alternative I'm all ears.