Software

I'm using all software listed below right now, so it's fairly stable. But it tested only on Linux (and some designed to work only on Linux).

Personal OpenID server
Very simple OpenID server for paranoid people who bother about their privacy and don't trust public OpenID service providers.
You'll need CPAN module Net::OpenID::Server to use it.
Also very good as simple starting point for developing your own OpenID server in Perl.
I wrote small article about it.
asciidoc.cgi
View your AsciiDoc-formatted documentation in browser.
This script will automatically convert your *.txt files into *.html on-the-fly when user send request to your website, so you can just update *.txt file and immediately view changes on website.
About documentation system
greysmtpd
tcpserver-compatible anti-spam (greylisting) smtpd.
Input Event
Allow you to configure keyboards with additional (multimedia) keys.
powerbackup
Simple and flexible incremental backup.
remote
Ease to use wrapper tools for ssh and scp.
deliver
Control email delivery (for .qmail only).
asdfDict
Search dictionary located in MySQL database.
libREV
Library for fake access to files from external app.
powerutils
A bundle of useful small utilities.