synctool is a cluster administration tool that keeps configuration files synchronized across all nodes in a cluster. Nodes may be part of a logical group or class, in which case they need a particular subset of configuration files. synctool can restart daemons when needed, if their relevant configuration files have been changed. synctool can also be used to do patch management or other system administrative tasks.
GLPI (Gestion Libre de Parc Informatique) is an information resource manager with an administration interface. You can use it to build a database with an inventory for your company (computers, software, printers, etc.). It has functions to make the daily life of the administrators easier, including a job/request tracking system with mail notification and methods to build a database with basic information about your network topology. It provides a precise inventory of all the technical resources (all their characteristics are stored in a database) and management and history of the maintenance actions and the bound procedures. It is dynamic and is directly connected to the users, who can post requests to the technicians.
Dar is a shell command that makes backup of a directory tree and files. Its features include splitting archives over several files, DVD, CD, ZIP, or floppies, compression, full or differential backups, strong encryption, proper saving and restoration of hard links, extended attributes, file forks, Door inodes, and sparse files, remote backup using pipes and external commands (such as ssh), and rearrangement of the "slices" of an existing archive. It can run commands between slices, before and after saving some defined files or directories (for a proper database backup, for example), and quickly retrieve individual files from differential and full backups. Several external GUIs exist as alternatives to its CLI interface, like kdar, DarGUI, SaraB, etc.
Spacewalk is a Linux and Solaris systems management solution. It allows you to inventory your systems (hardware and software information), install and update software on your systems, collect and distribute your custom software packages into manageable groups, provision (Kickstart) your systems, manage and deploy configuration files to your systems, monitor your systems, provision virtual guests, and start/stop/configure virtual guests.
chrony is a client and server for the Network Time Protocol (NTP). This program keeps your computer's clock accurate. It was specially designed to support systems with intermittent Internet connections, but it also works well in permanently connected environments. It can also use hardware reference clocks, the system real-time clock, or manual input as time references.
netconf is a tool designed to replace Debian's ifupdown in a backwards-compatible manner while aiming for maximum extensibility and flexibility. While it can read existing interfaces files and execute hooks in much the same way, it ties in closer with aspects of network configuration that have become more and more important in the past decade: link and location autodetection, including a framework to configure printers, smarthosts, proxies, etc.; zeroconf; wireless LAN configuration; VPN; firewalling; advanced routing and traffic control; and more.
Squid Account Management System (SAMS) is a Web-based interface and tool to manage users of a squid proxy server. It can manage users' access to squid, prohibition of users' to access to specific URLs, rewriting of requested URLs to graphical resources, and delay pools for user groups. It can save and build reports of users' statistics.