Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
Attendify - Develop relationships at the events that you attend by creating smaller events with just a few people.
UptimeRobot - Free Website Uptime Monitoring
Aventri - Aventri's event management technology has helped thousands of brands globally transform the way they plan and execute meetings and events while tracking and improving their business objectives.
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
Eventzilla - Eventzilla lets you sell tickets online and manage attendees from one integrated application.