ActivePerl is a (the?) Perl distribution win platforms, maintained by ActiveState (hence the name). For Un*x platforms, the distribution doesn't have a special name. Fetch the source or a precompiled binary from http://www.perl.com/.

As for the modules, sure, they will work on both platforms, but you might have to compile them seperately, if the contain C source code. The Details are in the README or INSTALL you find in the module bundle. You'll find the at CPAN.

Andreas