WIEN2k was developed by P. Blaha, K. Schwarz, G. Madsen, D. Kvasnicka and J. Luitz, at Inst. f. Materials Chemistry, TU Vienna, Austria.
WIEN2k is a DFT program package based on the full-potential (linearized) augmented plane wave + local orbitals method. It contains several other packages, e.g. for spectroscopy and DMFT.
Some useful documentation for WIEN2k:
Will be updated with more information later on.