Vectorworks is powerful and user-friendly CAD/BIM software for 2D and 3D design and presentation.
BiblioCAD has a large collection of CAD-files in multiple formats. You can download them for free if you sign up.
As an Architecture student you can download DWG-maps of Eindhoven, Amsterdam and Rotterdam provided by the TU/e. Log in with your student credentials.
Images and textures
Skalgubbar has a growing collection of cut-out people in PNG-format that you can use in your drawings or renders.
Textures.com offers many (seamless) textures that you can use to give an impression of the materials you use in your projects.
Visualizing Architecture by Alex Hogrefe is a website full with visualization tips and tutorials.