Buzzweb is a free and easily accessible tool that aims to make influencer marketing simpler. You can get a transparent rating for any Instagram account, based on the candid data, including the blogger’s engagement rate, their performance audience quality and reachability, whether they have fake likes and followers, and their core audience metrics.

F5Bot is a free service that emails you when your selected keywords are mentioned on Reddit, Hacker News, or Lobsters. Use it to monitor your brand, your projects, or just topics that you're interested in.