Optimizely - A/B testing you'll actually use.
Ansible - Radically simple configuration-management, application deployment, task-execution, and multi-node orchestration engine
VWO - Use VWO to tweak, optimize & personalize your website with minimal IT help.
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Google Analytics - Improve your website to increase conversions, improve the user experience, and make more money using Google Analytics. Measure, understand and quantify engagement on your site with customized and in-depth reports.
Puppet Enterprise - Get started with Puppet Enterprise, or upgrade or expand.