HighDeF

Views HDF5 files on Apple devices. Open an .h5 file and browse its groups and datasets in the sidebar, then read any dataset as a table, a plot, or an image — whichever suits the data. The app only reads the part of a dataset you are looking at, so even multi-gigabyte files open immediately and stay responsive. It is free and open source, and built on the HDF5 library.