This github organization collects code projects related to adaptive mesh refinement. It is managed by the DLR group "scalable adaptive mesh refinement" of the Institute for Software Technology.
t8code - Massively scalable adaptive mesh refinement library. You want to enhance your simulation with AMR? Try t8code!
t8data - Additional data for the t8code project. Input meshes, benchmark runs, etc.
png2mesh - Produce adaptive meshes from PNG pictures. We mainly use this library to create pictures of adaptive meshes.