Here is an incomplete list of projects using sphinx-gallery.
Apache TVM
Astropy
auto-sklearn
Biotite
Cartopy
FURY
pyGIMLi
HyperSpy
kikuchipy
Matplotlib
MNE-Python
napari
Nestle
NetworkX
Neuraxle
Nilearn
OpenML
OpenTURNS
Optuna
PlasmaPy
PyGMT
pyRiemann
PyStruct
PySurfer
PyTorch tutorials
PyVista
pyxem
RADIS
scikit-image
scikit-learn
SimPEG
Sphinx-Gallery
SunPy
Tonic
TorchIO