Sentry.io - From error tracking to performance monitoring, developers can see what actually matters, solve quicker, and learn continuously about their applications - from the frontend to the backend.
accessiBe - Making websites accessible to people with disabilities
AppSignal - We monitor the software that makes your customers happy.
tota11y - An accessibility visualization toolkit from Khan Academy
BugSnag - Not all bugs are worth fixing. Prioritize and fix software bugs that matter while improving software stability with every release.
Page Speaker - Modern web accessibility tools for agencies & webmasters