Log Owl - Open-source, privacy-focused error tracking and analytics

Nolt - A fast & beautiful way to collect user feedback

Olvy - Announce new features with beautiful and effective in-app widgets and standalone pages with our powerful release note tool, and see your release feedback turn into insights.

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

Hawk - Hawk provides visual user tracking and error reporting with live screen view, deep filtering and robust access control.

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.