Vector fields From I made a vector field visualizer : r/desmos (reddit.com) https://www.desmos.com/calculator/fdsxf8supc https://www.desmos.com/calculator/ls2sp8l05z animated vector field Phase Plane Plotter Flow of a vector field https://anvaka.github.io/fieldplay PDE https://visualpde.com/ specific examples whatever this is chessapig.github.io/sketch/tori/ Poincare section: Poincaré section clicker for the double pendulum - Leo C. Stein (duetosymmetry.com)