RISA

What is RISA

From RISA.com:
RISA has been developing leading-edge structural design and optimization software for over 30 years. Their products are used to design towers, skyscrapers, airports, stadiums, petrochemical facilities, bridges, roller coasters, and everything in between. With RISA's versatile modeling environment,and intuitive graphic interface, you can model any structure from bridges to buildings in minutes. UA has licenses for 3 of their packages: RISA-3D, RISAFloor, and RISAFoundation.