Links

http://www.csc.fi/elmer
Elmer official homepage (this site). The actual link is research.csc.fi/web/elmer but please rather use the permanent official link.
https://github.com/elmercsc/elmerfem
Elmer at GitHub where the source code is nowadays hosted. Apart from the main "elmerfem" repository there are also related repositories for tools and use cases.
http://sourceforge.net/projects/elmerfem/
Elmer at sourceforge including most importantly the Windows installer downloads.
http://www.elmerfem.org
The server for Elmer community including discussion forums and beyond. Everybody is free to register and participate.
http://www.elmerice.elmerfem.org/
Elmer in computational glaciology. This is the most active scientific community of Elmer.
http://www.nic.funet.fi/pub/sci/physics/elmer/
Elmer download repository at nic.funet.fi including binaries, documentation, slides etc.
https://postit.csc.fi/sympa/arc/elmerupdates/
Email list for updates on Elmer software
http://www.youtube.com/user/elmerfem
Elmer channel on Youtube including some movies
https://twitter.com/elmerfem
Twitter channel for Elmer

http://glaros.dtc.umn.edu/gkhome/views/metis
METIS - Family of Multilevel Partitioning Algorithms
(used by ElmerGrid in mesh partitioning)
https://computing.llnl.gov/projects/hypre-scalable-linear-solvers-multigrid-methods
HYPRE, scalable algorithms and software for solving large, sparse linear systems of equations on parallel computers
http://faculty.cse.tamu.edu/davis/suitesparse.html
Suitde Sparse, including also UMFPACK, unsymmetric multifrontal sparse LU factorization package.

http://gid.cimne.upc.es/
GiD - The personal pre- and postprocessor
http://www.geuz.org/gmsh/
Gmsh: a three-dimensional finite element mesh generator with built-in pre- and post-processing facilities
http://sourceforge.net/projects/netgen-mesher/
NETGEN - automatic mesh generator with Elmer output
http://www.cs.cmu.edu/~quake/triangle.html
Triangle, A two-dimensional quality mesh generator and delaunay triangulator
http://www.salome-platform.org/
SALOME : The Open Source integration platform for numerical simulation

http://www.paraview.org
ParaView - Parallel visualization application
https://wci.llnl.gov/simulation/computer-codes/visit/
VisIt visualization tool
http://code.enthought.com/projects/mayavi/
Mayavi tool for interactive visualization of data