Fore software (toolbox) and data related to Sentinel-1 check this website: https://sentinel.esa.int/web/sentinel/toolboxes/sentinel-1
” The Sentinel-1 Toolbox (S1TBX) consists of a collection of processing tools, data product readers and writers and a display and analysis application to support the large archive of data from ESA SAR missions including Sentinel-1, ERS-1 & 2 and Envisat, as well as third party SAR data from ALOS PALSAR, TerraSAR-X, COSMO-SkyMed and RADARSAT-2. The various processing tools could be run independently from the command-line and also integrated within the graphical user interface. The Toolbox includes tools for calibration, speckle filtering, coregistration, orthorectification, mosaicking, data conversion, polarimetry and interferometry.”
Note: The Sentinel-Archive is unfortunately a 2-month rolling archive. Hence to work with time-series is difficult when you do not download the required data in time.
” The S-1 Scientific data Hub Rolling Archive maintains the latest 2 months of products for download via HTTP. The target of the 2 months rolling archive will be reached in progression starting from a rolling period of 2 weeks commencing on the 3rd of October.”