OBLISK (Open Binary Linux Install System Kit) aims to make any package install on any modern GNU/Linux system. OBLISK packages are sent in an appdir-like package and can be run entirely in place, but also have an installer, which makes it possible for them to be installed to /usr or any other path.
YAMN (yet another maildir notifier) is a bash-script that notifies the user of new mail in an inbox using the maildir-format (like qmail supports) with playing a sound-file (using "play") or starting an application (using "kstart"). It is intended to be started as a desktop-link. The script can be heavily personalized and it contents a good description of its features.
The Eye Of Horus is a monitoring and alerting tool for computers. It's mainly useful for monitoring network services such as HTTP or SMTP servers and the internal status of Unix servers, including load, disk usage, and process counts. It is designed using independent modules with well-defined interfaces, making it easy to customize and extend.