Calendly is an app for scheduling appointments, meetings, and events.
Contentful is an API-first content management platform to create, manage and publish content on any digital channel.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Ubuntu is a free and open-source operating system on Linux for the enterprise server, desktop, cloud, and IoT.