Stephane Arnouts Suggestions and extensive testing Pierre Astier Suggestions and bug fixes Eric Aubourg Hints about how to optimize a C code Anthony Baillard Testing of model-fitting Mark Calabretta SExtractor makes use of his nice WCS library Pascal Fouque Suggestions and testing Delphine Hardin Suggestions and bug fixes Benne Holwerda For making his cookbook available Jean-Paul Kneib , Ian Smail Suggestions and spreading the software back in the early days! Ville Laurikari For his VL_PROG_CC_WARNINGS (modified to ACX_PROG_CC_OPTIM) Valerie de Lapparent Suggestions and testing of model-fitting Chiara Marmo For providing the VOTable to HTML XSLT filter and testing. Joe Mohr Suggestions and testing Gerard Tissier Preliminary implementation of the VOTable output Joachim Wuttke For his implementation of the Levenberg-Marquardt algorithm Institut d'Astrophysique de Paris University of Leiden European Southern Observatory University of Illinois Financial and technical support Too many people to list Help in discovering bugs or bringing suggestions