Here is the official Perl5 todo list: http://perl5.git.perl.org/perl.git/blob/HEAD:/Porting/todo.pod
You could also: - compile Perl5 blead and install modules - look on CPAN for modules that have test failures on blead, then work on fixes - learn to use perlbrew, cpanm, and other parts of the modern Perl toolchain - play with the code for dipsy, the #london.pm resident bot - work on a meetup style system for scheduling club meetings Feel free to follow up with other hacking topics. -sue
