WorldBrain (Re)search-Engine - Full-Text Search your Browsing History & Bookmarks
Meta Search - Search your Desktop, Google Drive, Dropbox, Gmail, Evernote.
Microsoft Web Activities - Microsoft's new extension bringing timeline to Chrome
Google Cloud Search - Search across all your company's content in G Suite.
Better History - Your Chrome Browsing history. Better.
Vaultedge - Access all your documents in one place.