UptimeRobot - Free Website Uptime Monitoring

Chirbit - Chirbit is a useful and fun tool that enables you to record, upload and share your voice or audio...

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.

Vocaroo - Vocaroo is a quick and easy way to share voice messages over the interwebs.

Status.io - Status.io is a platform for system status pages and status notifications. Companies rely on Status.io to track outages, schedule planned maintenances, broadcast status notifications, and much more; and their customers love the transparency.

Clyp - Clyp is the easiest way to record, upload and share audio. No account required.