This is of interest to people working on probabilistic programming, Infer.NET, machine learning and crowdsourcing. Upon request of Zooniverse, Microsoft has now released the software of the Bayesian crowdsourcing models developed during my MSR internships as an open source project (for academic use only). This project includes the implementation in C# / Infer.NET of many state-of-the-art crowdsourcing models developed within ORCHID (Dawid and Skene, BCC, CommunityBCC). It also provides functions for performing active learning with crowdsourced labels using these models. The code is available as part of its tutorial published on the Infer.NET blog: http://bit.ly/1o1aGHv , which is also a useful example of how to implement graphical models in Infer.NET. Enjoy!