This document provides information about Software Sondir, a freeware tool for sondir calculations in accordance with Indonesian National Standard 2827-2008. The summary includes: 1) Software Sondir allows users to perform sondir calculations and provides a simple interface for adding, editing, and deleting project data according to Indonesian standards. 2) It has features for adding and deleting multiple projects, editing data, and saving information by location, number, elevation, date, and person responsible. 3) The program calculates sondir measurements by allowing input of depth, cone resistance, total resistance, and equipment data such as sleeve length, piston diameter, cone diameter, and sleeve diameter.