Customer.io Slack Action - Send notifications into Slack, based on user activity
Analyzify - Google tag manager and analytics app for your Shopify store
Shopgram - A free analyzing tool for exploring top Shopify stores
Baremetrics for Shopify Partners - Subscription analytics & insights for Shopify app developers
MerchantSpring - Multi-channel analytics for Amazon, Walmart, eBay & Shopify
OneSignal Push Notifications for Shopify - Abandoned cart, automated campaigns, robust analytics.