We are a small group of devolopers from ThoughtWorks and from all over the planet working on Open Source Privacy Enhacing Technologies. CoyIM is one of our projects and you can check more about what we do at our GitHub repository. Our primary goal for this project is to create a program that is safe and secure by default.
CoyIM is still a very young project. It started on October 2015 and its primarly base was the project on Adam Langley's xmpp-client for Golang. There are many features missing and some will never be added since they go against the goal of having a small and safe client.