The Simulation Modeling Toolkit (https://smtk.org/) is a set of libraries for simulation pre-processing. You can process geometric models, discretizations of those models (meshes), add attributes like boundary conditions, write simulation input decks, and even submit jobs.
The Pulse Physiology engine is a C++ library that simulates human physiology that will drive medical education, research, and training technologies.
Discussion about this site, its organization, how it works, and how we can improve it.
Computational Model Builder (https://computationalmodelbuilder.org/) is a suite of applications built on ParaView and SMTK to help you prepare and submit simulations.