Plasma is an open source plotter that plots functions, vector fields, and parametric curves in 2D and 3D. A minimalistic console interface is used to enter plot expressions in a syntax similar to that of Mathematica. By including the variable t in the plot expression, the plot becomes a time-dependent animation. The mouse interface is intuitive, allowing the user to zoom, scroll, and rotate the plot with ease. Plasma is useful for producing high quality plots for papers, or even for aiding in the visualization of a mathematical problem.