I have tinkered around with the implementation of hybridizable Discontinuous Galerkin (HDG) methods in DUNE-PDELab and DUNE-FEM for my PhD but since then I have not had the time to work on these codes very much. Some things were possible back then, but others such as element-wise assemblies of the facet contributions or static condensation did not fit well into the concept and required a lot of work which is most probably not compatible anymore with current versions, since it involved reimplementing certain internals. That being said, this applied to almost any framework I tried out during that time, the only exception being NGSolve (which unfortunately had some compatibility issues with Mac OS X that lead me to give up on it after a while).
Two years have passed since then and I have certain things in mind which I want to try out in the future, but I still could not find THE framework for HDG; in fact it seems like there are loads of papers published on the method and its analysis for a whole zoo of problems, but the class of HDG methods is for the most part ignored by framework developers. Am I wrong?