Mentia - See what content will work best for you on social media
Ubersuggest - Want more traffic? Ubersuggest shows you how to win the game of SEO. Just type in a domain or a keyword to get started.
Juice by Paper.li - Share stories your followers will love (iOS)
Keyword Explorer by Moz - Find the best keywords to improve your website's SEO traffic
Value on board - Valueonboard helps you find your value proposition going through the whole problem-solution fit phase
Keyword Surfer - Get search volumes & keyword data directly in Google.