What software do you need to establish an architectural firm?
I would assume some basic software as listed below:-
1.An operating system and word processing software:-
Microsoft office package and microsoft project , window system and lotus or other email operating system
2.Cost effective architectural program package:- Revit/Archicad/Autodesk/Vectorworks.
3dmax/maxwell/artlantis or others
4.Cost effective image tools:-
Architectureasia has a list of cad softwares and links. to find out more...
And some comparisons of architectural software by sketchup forum here.
Comparisons of architectural software from pushpull forum here.