Stylebot - Change the appearance of websites instantly. Preview and install styles created by other users on stylebot.me

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.

FreeStylerWs - Styles and skins for all popular sites in the web

AppSignal - We monitor the software that makes your customers happy.

Stylem - A user style manager for Pale Moon, Basilisk, Interlink, SeaMonkey, and other Mozilla-based software. Install styles from userstyles.org to change how web pages and the application look.

BugSnag - Not all bugs are worth fixing. Prioritize and fix software bugs that matter while improving software stability with every release.