StatusOk (Open source) - Get notified through Slack/email when your website is down

Zinrelo - Zinrelo is an enterprise-grade loyalty rewards platform designed for the needs of mid to large businesses, offering a comprehensive solution to boost customer engagement, repeat sales, and revenue that maximizes customer loyalty.

Hyperping - Cheap uptime and performance monitoring with detailed reporting and flexible alerting

CashStar - CashStar is a provider of prepaid commerce solutions for the world's top retailers and restaurants.

Get Notified - Get Notified when something happens

Swagbucks - Swagbucks is a loyalty program that offers individuals rewards for engaging in various activities. Users can earn reward points for performing Internet searches, purchasing items from affiliated vendors, or completing polls.