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Polyglot Paas Without Vender Lock-In"Platform-as-a-service" or Paas is still a relatively new niche, but it isalready undergoing rapid changes and growing in many exciting ways.The first Paas systems supported one or a few programming languages andframeworks (such as Google App Engine) but with severe limitations. Thelimitations came in the form of only allowing a subset of a programming languageto be used as well as forcing the developer to use certain libraries andframeworks that the Paas required. This, whether intentional or not, isa type of vendor lock-in, since it means that a large amount of couldwould need to change to migrate to a different Paas.A new generation of Paas platforms have appeared with attempt to fix some orall of the above issues. These include Redhat Openshift, Heroku, Cloud Foundryand many others. This talk will serve as an outline to compare and contrastthe open source code and services of various Paas providers with a focus onpreventing vendor lock-in and supporting many languages and frameworks.