The catalog includes a tonne of software products with a wide range of technical applications, and several of these are being released to the public for the first time. Organised into 15 categories, the catalog includes software for data processing/storage, business systems, operations, propulsion, and aeronautics. Each of these contain dozens of software downloads. If you find it difficult to browse through all of them, you may want to begin with NASA's list of the top 20 requested software titles that are included in the catalog.