For experimentation, Sympa's team propose you a pre-installed Sympa server as a virtual machine (VMWARE). See virtual Sympa Server pages
Soji Ikeda built Sympa RPM packages for Red Hat EL 5 / CentOS 5: http://sympa-JA.org/download/RHEL5/
Sympa is included in the Mandrake distribution but latest package are provided below :
Sympa is incluced in Debian distributions. Debian package is maintained by Stefan Hornburg and Jean Charles Delepine :
FreeBSD port, Olivier Girard :
Solaris 7 package, Josep Román :
We created a list dedicated to discussions regarding Sympa packaging. You can find it and subscribe here: sympa-packagers