Browser Extensions
Hunchly2
Hunchly is a great tool for managing and documenting browser based content. More can be discovered at https://hunch.ly
Reverse Image Search
Many tools for reverse image search are found in different browsers. In Opera, the extension is called “Reverse Image Search” and hooks to google, yonder, bing, tineye and more.
Google Dorks Cheat Sheet
Advanced Google filtering cheat sheets:
https://gist.github.com/sundowndev/283efaddbcf896ab405488330d1bbc06
Maltego
Maltego is an OSINT application that is powerful in finding data driven relationships between assets. More can be discovered from https://www.maltego.com