GEstimator is a free and open source civil estimation application for Linux, Windows and MacOS. You can use this application to prepare cost and quantity estimates of civil and electrical works with detailed rate analysis. You can import your schedule from a .xlsx file or manually input and get estimate in .xlsx file also. It comes with comes DSR 2018 (Civil) and DSR 2018 (E&M) database. It is written in Python and released under GNU General Public License v3.0. It comes in three parts schedule ,Measurements and Resource.