BayesDB – a probabilistic programming platform
A lot of talk about this being aimed at "non-technical" people, but these types of interfaces are still widely needed for developers, too.  It can make trivial jobs much, much faster to complete both programmatically and through a GUI.  Technical folks like abstractions too!I like this quite a bit, although the similarity to SQL might pose more problems than it's worth in the long run.That and AmazonML's striking similarity to Excel/CSV (not to mention the crop of ML-on-demand providers) show these types of interfaces and user experiences are a pretty glaring need right now in data science / ML / classification.