ClearBrain - Predict which users will upgrade or churn tomorrow.

Nolt - A fast & beautiful way to collect user feedback

BurnChurn - 🔥 Reduce churn and track exit feedback for your SaaS

UseResponse - Open-source, self-hosted customer feedback software, live chat and helpdesk system that you can install on your server. Organize documentation using knowledge base and get feedback from social networks with centralized system

Churndown - Gather actionable feedback in one click

UserVoice - UserVoice integrates easy-to-use feedback, helpdesk, and knowledge base management tools in one platform that empowers users to speak and companies to understand.