Was browsing the internet today when I read that the WCF client code has been made open source.
I am very glad to hear about this as it means that soon applications on other operating systems in other languages will be able to call WCF services. According to my own knowledge using WCF in any other language has been limited to SOAP calls via http even though WCF was clearly developed with interoperability in mind. What remains unclear is whether the service hosting code will be made open source or ported to other operating system in the future. With my own knowledge of how Microsoft operates I expect them not to port or open source the hosting side of WCF.
Read more about it here.