... In general, I always suggest GAMS: Guide to Available Mathematical Software and/or Netlib as the starting points when looking for numerical source codes. Then try the other repositories when there's no success. ... Source Code Repositories . ... NCAR's Mathematical and Statistical Libraries -- collection of numerical codes. ... Numerical computation in C -- source code in C/C++. ... Ooura's Mathematical Software Packages -- various numerical C/Fortran code. ... SAL Home | Numerical Analysis . ...