Vaultedge - Access all your documents in one place.
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Meta Search - Search your Desktop, Google Drive, Dropbox, Gmail, Evernote.
allTags - allTags is a free, tag based file management application.
eesel - The new tab for work
Tabbles - Tabbles use tags to organize and find files along with your colleagues.