"Affymetrix Power Tools (APT) are a set of cross-platform command line programs that implement algorithms for analyzing and working with Affymetrix GeneChip® arrays. APT is an open-source project licensed under the GNU General Public License (GPL)."

APT files for Affymetrix array normalization (RMA) and alternative exon analysis (MiDAS) are included in the folders AltDatabase/affymetrix/APT for specific operating systems.