Lethe (pronounced/ˈ li ː θ i ː/) is an open source computational fluid dynamics (CFD) software that uses high-order continuous Galerkin formulas to solve incompressible Navier Stokes equations (etc.). The Lethe consists of a series of deal.II This is a finite element library. Through the deal 2. Lethe uses Trilinos for his sparse linear algebra routines, and p4est for his distributed adaptive quadtree and octree.
Lethe was initially started as a weekend project, but gradually developed into CFD software used in actual research. It is still an immature project, but it is under active development.