Raygun - Raygun gives developers meaningful insights into problems affecting their applications. Discover issues - Understand the problem - Fix things faster.
Website Grader - Grade your website's strengths and weaknesses in seconds.
Snare - Snare is well known historically as a leader in the event log space.
PageSpeed Ninja - One-click page speed boost for WordPress
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.
WebSite Auditor - The techie's SEO spider: find site issues other tools miss