Evercontact - Your contacts always up to date and automatically with Evercontact.
StatusOk (Open source) - Get notified through Slack/email when your website is down
CONTACTBOX - CONTACTBOX combines the simplicity of an address book with effective functions of a CRM system.
Hyperping - Cheap uptime and performance monitoring with detailed reporting and flexible alerting
Pobuca Connect - Connect with your contacts.
Get Notified - Get Notified when something happens