NEST-DORIS is an InSAR processing environment that is fully-compliant with state-of-the-art buzzwords: free, open-source, cross-platform, algorithmically rich, interactive, graphics, objects, higher-order functions, and more. It is built on top of jDoris InSAR API, and NEST SAR Toolbox.
support for almost everything that flies
efficient? not yet, but give us some time
fully integrated in NEST
command line and gui processing
Linux, OSX, Windows, (maybe?) BSDs