We use Python for Websocket servers as well as other utilities throughout the company.
We use RabbitMQ quite heavily across both legacy and current products for everything from work queues to communications products and messaging.
The built-in Gamification that comes with our Playbooks application uses NSQ for work queues and microservice communication.
We use Couchbase heavily in our PowerStandings platform to enable real-time analytics of agent data, as well as data storage for parts of our new Playbooks product.
The large majority of the microservices and workers in our latest product's architecture are written in Go.
Our new product at IndideSales.com is built in Docker, from development through production. Everything is "Dockerized"!