Recommend Pro - Recommend Pro is the personalisation platform with ability to provide personalised recommendations, set up mass email campaigns, smart campaigns, send push notifications and more.
UptimeRobot - Free Website Uptime Monitoring
BEYABLE - Real-time personalization solutions for e-commerce & lead gen websites
Uptime Kuma - A fancy self-hosted monitoring tool.
Marketizator - Omniconvert is an award-winning conversion rate optimization (CRO) software that can be used for A/B testing, online surveys, traffic segmentation, web personalization and more
OnlineOrNot - Uptime monitoring for software teams (even teams of one).