Doug Engelbart's call for a world wide open hyperdocument system (OHS) identified the key features and functionality needed in our information technology, across all platforms and applications, across all knowledge domains, to enable today's more agile and transformative teams, networks, scholars, communities, organizations, and institutions to perform to their highest potential. page 
Eugene Eric Kim created the OHS Launch Community which ran for six months in 2001. The ad-hoc group's goals were to achieve a common understanding of the OHS, to document this collective knowledge, and to facilitate collaboration among our members. page
Hypothes.is, announced April 2016 is an open source annotation tool which offers the ability to highlight, comment, tag and link directly to any point in a webfile, across the web. This is exactly the type of approach that Engelbart envisioned. site