At foodpanda we aim to create an environment which allows to innovate fast. Every team can introduce new processes, tools and technologies, if they can convince the Architecture board (tech leads) that is makes sense according to foodpandas architecture guidelines. Since the early PHP/Zend/jQuery days the tech stack we are using for the different components and services in our global platform got pretty diverse.
As the next step we plan to enhance these information using the ThoughtWorks Tech Radar approach, like Zalando recently did. Technologies like ZendFramework, Icinga, Puppet would then be clearly visible as legacy, we do not recommend anymore for adoption in new projects.