The program is based on the powerful model-free method of time series analysis Caterpillar (another name is SSA - Singular Spectrum Analysis). More by: 1 The program for extended Singular Spectrum Analysis (SSA) of time series. APS Accounting and stock 1.1 Easy to use Accounting APS combines highly powerful multilingual accounting software and stock control features with a wide range of reports such as general ledger, profit and loss, trial balance, statement. ApS-Ethos - Industry Proven, Professional Software for Embroidery Design, Laser Cutting and Laser Engraving. The Organiser module is the ApS-Ethos design storage software. The design storage module allows designs to be stored and catalogued. Click the Features link above for some great tools available in ApS-Ethos.