StatusPage.io - StatusPage.io is the best way for web infrastructure, developer API, and SaaS companies to get set up with their very own status page in minutes. Integrate public metrics and allow your customers to subscribe to be updated automatically.
FourZeroFour - Showcase of the best error pages on the web.
SaaSFrame - Browse hundreds of SaaS marketing pages, product interfaces and email flows.
404 Illustrations - Open-source catchy illustrations for perfect error pages
Marketing Inspo - Get inspired by this collection of marketing examples.
statuspage - A simple self-hosted status page site with an API written in Django under the BSD license.