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by Dmitry_Bryliuk 3872 days ago
sounds somehow similar to your goals: http://project-identity.com

it is a free web solution. it is possible to organize both by folders and tags (properties/relations) and then search by keywords with respect to properties and relations.

any info can be shared or private. you may search through all users or a specific user. you may filter out which group of users to search inside or skip.

however it requires google account and no attachments now, it is possible to use google drive for your files and put links to gd into the system.