We use it in the majority of our webapps
We used Gulp in each frontend and Node.js project to automate development & build tasks
We encapsulate all our microservices in a Docker container
Used in development
Sit's in front of our web apps
A lot of our tools that run on our IoT devices are written in Node.js. The simplicity & async nature of Node.js makes it very easy and efficient to develop and maintain these tools.
Used for Ruby development of our web applications
Used to host public code. We've don't put that much effort in open source for the moment. We're a startup :)
We host our private our repositories on Bitbucket.