CSI ETABS, SAFE, and SAP2000 are all software programs used for structural analysis and design.

CSI ETABS stands for Computer and Structures, Inc. Extended Three-dimensional Analysis of Building Systems, is a software program for building design and analysis, specifically for tall buildings.

SAFE stands for Structural Analysis for Excel and is a software program for foundation design, specifically for mat foundations, spread footings, and combined footings.

SAP2000 stands for Structural Analysis Program with Integrated Analysis of Systems and is a general-purpose software program for civil engineering, specifically for the analysis and design of structures, including buildings, bridges, and towers.