Plots
GridVisualize/PlutoVista
Plotting is possible e.g. via Nodal Evaluations and the plot routines from ExtendableGrids.jl. In Pluto notebooks it is recommended to use PlutoVista.jl as an backend.
UnicodePlots
For a fast and rough peak several UnicodePlots plotters are available via an extension (ExtendableFEMBaseUnicodePlotsExt) that is loaded when UnicodePlots is available.