For the launch of Joule 3.0, the primary compilers will be:
GCC 13.2.0:
https://gcc.gnu.org/
and
AMD AOCC 4.1.0:
https://www.amd.com/en/developer/aocc.html
Both compilers will have an OpenMPI 4.1.x module available. Documentation for OpenMPI 4.1.x can be found at https://www-lb.open-mpi.org/doc/v4.1/.
If you need help compiling a program, please create a ticket so support can assist you.