Cusdis - Open-source, lightweight comment system for your website
Comments by Highlight - Collaboration on Highlight makes debugging faster than ever
Comments for Zillow (Chrome Extension) - The fabled comment section on zillow
Eccco - Record a listen short audios, like Twitter but with voice.
Localize - Localize is a no-code translation solution for SaaS platforms, allowing you to easily translate your web app, dashboard, API docs, and much more.
Email Comments - Add Google Docs like comments to Gmail