slapi-dnsnotify is a plugin for OpenLDAP or other LDAP servers. It watches for changes in the serial number of a DNS zone stored in the LDAP server, and notifies DNS slave servers to refresh their copy of the zone. It can also increment the serial number of a zone whenever changes in that zone are made.
tunctl is a small tool for controlling Linux TUN/TAP devices. TUN/TAP devices are virtual network devices where software emulates the wire. With the help of tunctl, such virtual devices can be pre-created and assigned to non-root users for later use, e.g. in virtualization or emulation setups. Many other applications of TUN/TAP devices exist.
TCL2FTP is an extension library for Tcl scripts which allows Tcl programs to perform FTP client and gateway actions. It fully supports the FTP/FXP protocols, is ready for use with SSL/TLS, and is compatible with glFTPd. It can run simple FTP commands, and it supports 25 simultaneous FTP sessions.
sbills is an Internet traffic monitor. If, for example, you have a local network with a Linux server that provides users with Internet access, it allows you to control Internet traffic. It features traffic calculation (received and transmitted) and the ability to limit Internet access by setting a daily traffic limit.