F5Bot - F5Bot will send you an email whenever your brand, product, or keyword is mentioned online.
Startup Stash - A curated directory of 400 resources & tools for startups
KWatch.io - Monitor Keywords on Reddit, Twitter, Linkedin, Quora, Facebook, and Hacker News. Receive an instant alert when specific keywords appear on social media.
Content Marketing Stack - A curated directory of content marketing resources
Syften - Better social media keyword alerts
StartupResources.io - Tightly curated lists of the best startup tools