Coderway.net - Unlimited creative options
Analyzify - Google tag manager and analytics app for your Shopify store
ClippingMagic.com - Remove image backgrounds online. Make backgrounds transparent, white, etc. Edit, crop, rotate, fix colors, add shadows, all you need for great photos!
Baremetrics for Shopify Partners - Subscription analytics & insights for Shopify app developers
Xero - Xero is online accounting for your small business.
OneSignal Push Notifications for Shopify - Abandoned cart, automated campaigns, robust analytics.