Various citations at scholar.google.com, including applications, software packages, and algorithm research that utilizes PETSc: 1, 2, 3.

How to cite PETSc in your publications.

Images and Movies produced by PETSc libraries and applications

See Acknowledgments for software packages that PETSc uses.

PETSc has been used for modeling in all of these areas: Acoustics, Aerodynamics, Air Pollution, Arterial Flow, Bone Fractures, Brain Surgery, Cancer Surgery, Cancer Treatment, Carbon Sequestration, Cardiology, Cells, CFD, Combustion, Concrete, Corrosion, Data Mining, Dentistry, Earth Quakes, Economics, Esophagus, Fission, Fusion, Glaciers, Ground Water Flow, Linguistics, Mantel Convection, Magnetic Films, Material Science, Medical Imaging, Ocean Dynamics, Oil Recover, PageRank, Polymer Injection Molding, Polymeric Membranes, Quantum computing, Seismology, Semiconductors, Rockets, Relativity, Surface Water Flow.