fricas : FriCAS is a fork of Axiom computer algebra system ( http://fricas.sourceforge.net/ )
petsc : Portable, Extensible Toolkit for Scientific Computation ( http://www.mcs.anl.gov/petsc/ )
slepc : Scalable Library for Eigenvalue Problem Computations ( http://www.grycap.upv.es/slepc/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a seeds
For Paludis use this rsync : rsync://gentoo.zugaina.org/seeds-portage
If you have a problem : ycarus(-at-)zugaina.org