Losboskie,
We use fairly common software for most of our design and presentations so that it is easily integrated into the clients building management documents.
We use CAD for line drawings, wire schedules, and as builts. All of the GC’s, Architects, etc have access and use this as well.
We use 3D Studio max for modeling and prototype mock ups. We find that there is a large library odf items already made for this software that can be purchased inexpensively (Free to $20) and we alter the color and/or textures to customize them. 3D studio is also compatible with our 3 Dimensional printer that allows us to prototype mounts, adapters, etc, or provide 3D models of rooms to customers.
For Scope of Work we use word, and just utilize some of the great indexing/table features that allow you to create an interactive table of contents in the front that links to other parts of the documents. Same thing for bids, Excel with some higher level Macros that allow us to see the job from many angles (costs, Margin, Profit, etc).
Scheduling is done in MS Project.
Most of our marketing materials are in Adobe Illustrator or In Design.