Hyperping - Cheap uptime and performance monitoring with detailed reporting and flexible alerting
Domainz.io - Premium domains, for not so premium prices
UptimeRobot - Free Website Uptime Monitoring
Amazon Route 53 - Amazon Route 53 is a highly available and scalable DNS web service.
UptimeRobot App - Web, SSL, ports & Cron-jobs monitoring
Brandpa - Domain names for startups