  Electron tomography in materials science has flourished with the demand to
characterize nanoscale materials in three dimensions (3D). Access to
experimental data is vital for developing and validating reconstruction methods
that improve resolution and reduce radiation dose requirements. This work
presents five high-quality scanning transmission electron microscope (STEM)
tomography datasets in order to address the critical need for open access data
in this field. The datasets represent the current limits of experimental
technique, are of high quality, and contain materials with structural
complexity. Included are tomographic series of a hyperbranched Co2P
nanocrystal, platinum nanoparticles on a carbon nanofibre imaged over the
complete 180{\deg} tilt range, a platinum nanoparticle and a tungsten needle
both imaged at atomic resolution by equal slope tomography, and a through-focal
tilt series of PtCu nanoparticles. A volumetric reconstruction from every
dataset is provided for comparison and development of post-processing and
visualization techniques. Researchers interested in creating novel data
processing and reconstruction algorithms will now have access to state of the
art experimental test data.
