Cloudcraft uses Ansible
Ansible is the deployment tool for people who don't like deployment tools. It's close to scripting, doesn't pollute your servers with agents or centralized servers, and just makes immediate sense. The entire stack at Cloudcraft.co is orchestrated by Ansible. What does that mean? Beyond the obvious of installing packages and configuring services, Ansible coordinates all the machines into a working deployment: It adds API servers to the loadbancer pool, opens ports on the DB server for the backend servers to connect, gracefully upgrades services in a rolling fashion for zero-downtime deployments etc. And it's so easy to use, it's easier to use than doing things by hand, meaning it's a deployment tool you'll actually use every time!
cyrusstoller uses Puppet Labs
I'm using puppet to configure my servers. This makes it really simple to ensure that I have the same environment. There is a bit of a learning curve, but the repeatability definitely makes it worth the effort. I found puppet to be a little easier to pick up relative to chef, but I've used both. They're both great solutions.
I really like that there are a lot of modules available on the puppet forge that are being actively maintained.
Kalibrr uses Ansible
All of our servers are provisioned by Ansible, with no manual provisioning involved. This lets us easily roll out new servers, with no chance for human error when configuring the servers. We use the same code to provision local development environments on Vagrant, which eliminates configuration discrepancies between development and production.
Trusted Shops GmbH uses Puppet Labs
We provision all servers with puppet. We have one central Puppet server which uses puppet modules referenced by a Puppetfile. Those puppet modules are partly from forge and partly self written.
All modules which are self written, have to be tested using rspec-puppet and beaker.
Scrayos UG (haftungsbeschränkt) uses Ansible
We use Ansible to synchronize the few configuration-options we've taken on our CoreOS-Machines. This makes deployment even easier and the fact that it's Agentless made the decision even easier.
b08p uses Ansible
Ansible is used in both the development and production deployment process. A playbook couple with a Vagrantfile, easy deploys a local virtual machine that will mirror the setup in production.
sapslaj uses Ansible
I use Ansible to manage the configuration between all of the different pieces of equipment, and because it's agentless I can even manage things like networking devices all from one repo.
Opstax Ltd uses Puppet Labs
Opstax uses puppet for role/profile based configuration management and the distribution of small/static code.
GeniusLink uses Puppet Labs
Configures or servers and allows us to be region independent we have 5 regions across the globe.