Keep Your Friends Close - A free e-book about maximizing Customer Lifetime Value
BlockSurvey - Privacy-focused surveys, polls & forms
Receiptful - Receipts that increase CLTV. Exclusive (early access to PH)
Refiner - Customer Feedback Surveys For SaaS
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Surveys in Slack by Polly - The world's first fully immersive Slack-based survey product