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Networking

Rdesktop
Linux client for Windows Terminal Services, allows remote access to Windows applications.
http://www.rdesktop.org/

NET-SMTP
Free Simple Network Monitoring Protocol tools including an extensible agent, a trap demon, an SNMP library, and other SNMP applications.
http://net-snmp.sourceforge.net

Samba
Allows Linux and Unix servers to provide Windows file and print services.
http://www.samba.org

Asterisk
Complete conventional PBX phone system in software that runs on Linux, BSD and Mac OS X. Embedded in many voice-over-Internet-Protocol and interactive voice response systems.
http://www.asterisk.org

Zabbix
Network and application monitoring tool written in PHP.
http://www.zabbix.com

iFolder
Cross platform file sharing and synchronization.
http://www.ifolder.com