All of the following tools and resources for Objcet Design practices (incl. Product Design, Industrial Design etc.) are available online, most of them for free – though sometimes with limitations (e.g. time, number of downloads etc.).
Resources
Abstract: Art of Design (Documentary)
A Netflix original documentary series highlighting creatives in the field of design. Subscription
Tools
Blender (CGI/3D Modelling)
Blender for years has been a secret weapon in the CGI world for low budget productions that cannot afford the high end licenses of competing CGI softwares.
Free
Fusion 360 (CAD/CAM/CAE)
Fusion 360 by Autodesk connects the entire product development process into a single CAD/ CAM/CAE cloud-based platform.
Free (trial; also renewable 1-year licenses for Education)
Sculptris (Sculpture, 3D Modelling)
Sculptris is three-dimensional modelling software that’s specifically tailored to accommodate the needs of sculptors, visual artists and 3D designers. (More information)
Free
Sketchup (3D Modelling, Architecture)
SketchUp is a 3D modeling software for a wide range of drawing applications such as architectural, interior design, landscape architecture, civil and mechanical engineering, film and video game design.
Free (Sketchup Pro offers free licenses for education institutions)
More tools and resources of interest for this area may be found in the posts for Media Arts, Sculpture or Spatial Design.