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We can visualize some concepts using the following activities.

CalcPlot3D is a powerful app that can be used to demonstrate many concepts in multivariable calculus.

• CalcPlot3D, by Paul Seeburger
  • https://c3d.libretexts.org/CalcPlot3D/index.html - links to CalcPlot3D and other resources.

The 3-D version of Geogebra and Geogebra apps designed for particular aspects of multivariable calculus are linked in this list:

• GeoGebra 3-D
• Graphing functions of two variables, by Judy Munshower
• Cross sections with x fixed, by Judy Munshower
• Cross sections with y fixed, by Judy Munshower
• Contour diagrams of functions of two variables, by Judy Munshower
• Contour plot and surface, by Mike May
• Tracing out surfaces in 3D, by Lenore Horner
• Vector Projections, by Tim Brzezinski
• Cross Product, by Tim Brzezinski
• Volume of a Parallelepiped, by Chris Mizell
• Partial derivatives, by Tim Brzezinski
• Partial derivatives for quadratic functions, by Joseph Manthey
• Tangent planes, by Kevin Hopkins
• Directional derivative, by Alfredo Sánchez Alberca
• Gradient fields, by Andreas Lindner
• Taylor polynomials for functions of two variables, by Andreas Lindner
• A Lagrange multiplier example, by Yin Bon Ku
• Double integrals, by Yin Bon Ku
• 2-D Riemann sum, by Lenore Horner
• Iterated double integrals, by Kristen Beck
• Double integral over Type I region, by Yin Bon Ku
• Spherical Coordinates Demonstration tool, by Norm Prokup
• Curve in 3D, by Yin Bon Ku
• Motion in space, by tenkosky
• Vector fields (in the plane), by Juan Carlos Ponce Campuzano
• Vector fields 3D, by Juan Carlos Ponce Campuzano
• The Flow of a vector field, by Kim Rescorla
• Vektorfeld im R³, by Andreas Lindner
(Vector field and flow lines)
• Curvilinear integral of a vector field in R³, by Andreas Lindner
• Surface integral of a vector field over a surface, by Juan Carlos Ponce Campuzano
• Divergence and curl calculator, by Juan Carlos Ponce Campuzano
• Divergence and curl of 3D vector field, by Lenore Horner
• Parametric Surfaces (sample surfaces), by Juan Carlos Ponce Campuzano
• Parametric Surfaces (generate your own surfaces), by Lenore Horner
• Jacobian Locus, by Joseph Manthey
• Jacobian, by Joseph Manthey
• Jacobian Animation, by Joseph Manthey
• Geometric interpretation of the Jacobian, by Juan Carlos Ponce Campuzano