Cachet - Cachet is a free, open source status page for your API, service or company. Built with all of the features that you'd expect from a status page.
Stashboard - Stashboard is a status dashboard for APIs and software services.
tawk.to - tawk.to is a free live chat app that lets you monitor and chat with visitors on your website or from a free customizable page
Smashing - Smashing is a fork of Dashing (which is no longer maintained), a Sinatra based framework that lets you build beautiful dashboards.
Staytus - Staytus is a free, open source & beautiful status site that you can install on your own servers. It's a fully-loaded with all the features you'd expect from any site you might pay for.
Crisp Chat - Multi-channel customer support software