I help maintain a Perl-based accounting/erp application called LedgerSMB, as well as a number of CPAN modules (so far, everything in the PGObject namespace but that's open to other participation), and Mail::RoundTrip which implements common functions for queuing results pending a user receiving an email and clicking on a link or replying to it (the actual mechanisms of reply are left to the application).

I also co-founded Efficito which offers LedgerSMB hosting.