ActiveState Tool Corp.
   Providing a Win32 Perl-port, Perl for ISAPI, a graphical Win32 Perl-Debugger and other professional tools for Perl developers.
   http://www.activestate.com/

IndigoPerl
   A binary build of Perl 5.6 for Win32 with an integrated Apache webserver for testing and developing CGI scripts.
   http://www.indigostar.com/indigoperl.htm

Intergraph port of Perl 4.036 for NT 3.5
   An older (it's not Perl 5!) Perl 4 port.
   ftp://ftp.intergraph.com/pub/win32/perl/

Qub Group
   Offering YeP-perl a Cygwin-Perl-port and DBI:DBD ODBC, Oracle, mSQL, perl5 with GUI, perl5 for Win32 plug and play distribution. perl5 modules, extesions and projects, Visual perl GUI debugger environment.
   http://www.qub.com/group/