StatusOk (Open source) alternatives

Monitor your website's availability, review its performance and get notified when your website goes down. No installation required and free plan available.

Troops.ai provides salesforce automation platform that gives real-time transparency around salesforce information. It serves as a Slackbot for sales team.

Ping is a beautiful Linux monitor app, it supports linux-based systems too. It allows you track your Linux servers' status easily. You only need to add your Linux servers to Ping using SSH account and Ping will show metrics. No dependency required, no deamon required.

Website peace of mind. Haark keeps track of all of your websites and makes sure you’re the first to know if they’re down. Developers and project teams alike use Haark as their early warning system so they can be on their A-game with clients.