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.
AppSignal - We monitor the software that makes your customers happy.
WP Umbrella - The easiest way to manage multiple WordPress websites effortlessly.
PreFlight - Preflight is an Automated Web Testing tool. Allows everyone to automate Web UI tests.
Orbitype - SEO & workflow focused WordPress admin
Rollbar - Rollbar collects errors that happen in your application, notifies you, and analyzes them so you can debug and fix them. Ruby, Python, PHP, Node.js, JavaScript, and Flash libraries available.