The GNU/Linux Semantic Storage System (GLSł) is an open source
semantic storage solution for GNU/Linux that indexes your data,
extracts from it metadata and relevant information, allows you to
organize it using queries and tags, provides shared schemas between
applications through an API, an extensible Type System, a pseudo file
system for backward compatibility, a web interface, As-You-Type
searching and more.

GLSł is built for GNU/Linux, and is made to offer a solution for the
ever-expanding problem of the increase in user data and the lack of
appropriate, scalable-enough means to organize this data. It is built
to remedy the lack of organization and searching capabilities in the
widely available hierarchical file systems, by providing means for
end-users and developers to organize and search through their data
through a semantic abstraction.

For more information, including video demonstrations, visit the
website:
http://www.glscube.org/