A first version of our Toolbox to read the datasets provided by the TanDEM-X mission of DLR is released as Open Source software under the GPL as TanDEMXforMATLAB on GitHub.
More Information on the TanDEM-X mission can be found at the DLR Homepage.
And some more technical related content regarding the interferometric mission at the TanDEM-X Science Service System and the monostatic SAR operation at the TerraSAR-X Science Service System.