NEST is a new ESA toolbox with an integrated viewer for reading, calibration, post-processing and analysis of ESA and 3rd party SAR data including ERS-1 & 2, ENVISAT, JERS-1, ALOS PALSAR, TerraSAR-X, and Radarsat-1 & 2. Distributed as fully open source, NEST allows users to easily develop new readers and post-processors for SAR data by means of a Java Application Programming Interface (API). NEST is developed by Array Systems Computing Inc. under contract to ESA.