Robuta

https://freefem.org/

FreeFEM - An open-source PDE Solver using the Finite Element Method

A free and open source software to solve partial differential equations (PDE) using the Finite Element Method (FEM)

open source finite element freefem pde solver

https://www.sidefx.com/ja/forum/topic/43704/

finite element solver: External Velocity Field, how to use? | Forums | SideFX

finite element solver velocity field external use forums