People who ...

• publish or contribute to CPAN modules
• answer Perl questions
• improve documentation
• translate documentation
• act as release managers
• submit bugreports
• submit reports to cpantesters
• organize conferences
• speak at conferences
• donate money to TPF or developers
• volunteer for administrative/legal stuff
• maintain websites and services (perl.org, metacpan.org, search.cpan.org, ...)
• blog about Perl
• solve problems in Perl, and publish their programs
• reach out towards non-Perl programmers
• run programs like Google Summer of Code, Google Code-In, TPF grants, ...
• write books
• write tutorials
• create development tools (IDEs, syntax hilighter, ...)

(in no particular order, and no claims on comprehensiveness).

And of course there are those who support the Perl contributors. Many of us have families that support them, and without which we couldn't do what we do.

I'm afraid that I know too many individual people whose code, websites and services I use nearly every day to even start listing them.