FreeLing was originally written by people in TALP Research Center at Universitat Politecnica de Catalunya (http://talp.upc.edu).
Spanish and Catalan linguistic data were originally developed by people in CLiC, Centre de Llenguatge i Computacio at Universitat de Barcelona (http://clic.ub.edu).
Many people further contributed to by reporting problems, suggesting various improvements, submitting actual code or extending linguistic databases.
A detailed list can be found in Contributions section at FreeLing webpage
(http://www.lsi.upc.edu/~ nlp/freeling).