Developed and marketed by Autodesk,AutoCAD was first released in December 1982, running on microcomputers with internal graphics controllers.
AutoCAD is used across a wide range of industries, by architects, project managers, engineers, graphic designers, and other professionals. It is supported by 750 training centers worldwide as of 1994. AutoCAD is the most popular CADD software with the highest overall job-market demand. There are also specialized versions of AutoCAD and other Autodesk products designed for drafters in specific job-roles and industries.
STAAD or (STAAD.Pro) is originally developed by Research Engineers International at Yorba Linda, CA in year 1997. In late 2005, Research Engineers International was bought by Bentley Systems.
STAAD. PRO is a new tool for Civil Engineering Students which is in huge demand now a days. STAAD.PRO is a structural analysis and design program with applications primarily in the building and Real-estate industry- like commercial buildings, bridges and highway structures, industrial structures, chemical plant structures, dams, Turbine foundations, culverts, other embedded structures etc.
Revit building design software is specifically built for Building Information Modelling (BIM) (US site), including features for architectural design, MEP and structural engineering and construction.
Revit can be used as a very powerful collaboration tool between different disciplines in the building design sphere. The different disciplines that use Revit approach the program from unique perspectives. Each of these perspectives is focused on completing that discipline's task. Companies that adopt the software first examine the existing work flow process to determine if such an elaborate collaboration tool is required.