June for Slack - Instant analytics, right in Slack
Google Analytics by SumoMe - The easiest way to see your Google Analytics
Adalyz - Compare Your Google Adwords Vs Facebook Ads Vs Instagram Ads and decide where to put your money. Powerful analytics and reporting for your ad campaigns.
Metric.live - Real-time and advanced periodic alerts for Google Analytics.
BiggerCake - The data tool that Kickstarter deserves
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.