The fimex-program is considered stable and the releases are those used in production at met.no. API- and configuration changes are still likely between two releases.
Development versions can be found in the git repository: https://github.com/metno/fimex.git. Development usually occurs in the trunk, so it might become instable any time. Stable versions can be found under tags.
It is possible to browse the code: https://github.com/metno/fimex
The old svn repository https://svn.met.no/viewvc/fimex/ is set to readonly since 2016-02-15.
Since fimex 0.63, Ubuntu packages are available on launchpad from the MET Norway Fimex PPA. At present, packages are made available for Ubuntu versions:
Previous versions are also available on launchpad, from another PPA: