Infoga is a tool gathering email accounts informations (ip,hostname,country,…) from different public source (search engines, pgp key servers and shodan) and check if emails was leaked using haveibeenpwned.com API. Is a really simple tool, but very effective for the early stages of a penetration test or just to know the visibility of your company in the Internet.
You can find this tool in the data resource section under useful tools and unique searches