monit is a utility for managing and monitoring, processes, files, directories and devices on a UNIX system. Monit conducts automatic maintenance and repair and can execute meaningful causal actions in error situations.
Samba is a suite of Unix applications that speak the SMB (Server Message Block) protocol. Many operating systems,including Windows and OS/2, use SMB to perform client-server networking. By supporting this protocol, Samba allows Unix servers to get in on the action, communicating with the same networking protocol as Microsoft Windows products.
OTRS is an Open source Ticket Request System (also well known as trouble ticket system) with many features to manage customer telephone calls and e-mails. The system is built to allow your support, sales, pre-sales, billing, internal IT, helpdesk, etc. department to react quickly to inbound inquiries.
Sudo is a program designed to allow a sysadmin to give limited root privileges to users and log root activity. The basic philosophy is to give as few privileges as possible but still allow people to get their work done.
cron-apt Contains a tool that is run by a cron job at regular intervals. By default it just updates the package list and download new packages without installing. You can instruct it to run anything that you can do with apt-get (or aptitude).
syslog-ng© is the world's most flexible and scalable audit trail processing tool for organizations of any size. It provides a centralised, securely stored log of all devices on your network, whatever platform they run on. And syslog-ng also incorporates a host of powerful features, including filtering based on message content, as well as customisable data mining and analysis capabilities.