Here I'll try to describe some of my hacks, scripts and applications. It is not meant to be a comprehensive list. The most comprhensive list is probably my list of repositories on Github.
Perl modules
Parse::DNS::Zone
A Perl module for parsing DNS zone files, as described in RFC 1034. See its manual on CPAN.
Net::SMS::Cellsynt
A Perl module, implementing the HTTP API exposed by the Swedish SMS gateway provider Cellsynt. See its manual on CPAN.
Regexp::Common::Chess
A Regexp::Common Perl module for matching valid standard algebraic notation (SAN) move specifiers in Chess. See its manual on CPAN.
Misc
EthURL
A small url-shortener web service using the Dancer framework. Uses an authenticated API to publish URLs. Available from github. I wrote it as a learning project for learning and playing around with Dancer.
irssi scripts
I've written two, three scripts for the popular IRC client irssi. The most popular is the "youtube-title" script, automatically querying Youtube for the title everytime somebody posts a link to a video, and prints it in the window. It, and other similar small scripts, can be found in my hacks repository on Github.