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Transmission has been built from the ground up to be a lightweight, yet powerful BitTorrent client. Its simple, intuitive interface is designed to integrate tightly with whatever computing environment you choose to use. Transmission strikes a balance between providing useful functionality without feature bloat. Furthermore, it is free for anyone to use or modify.

Service discovery on a local network -- this means that you can plug your laptop or computer into a network and instantly be able to view other people who you can chat with, find printers to print to or find files being shared. This kind of technology is already found in MacOS X (branded 'Rendezvous', 'Bonjour' and sometimes 'ZeroConf') and is very convenient.

Balance is a simple but powerful generic TCP proxy with round robin load balancing and failover mechanisms. Its behaviour can be controlled at runtime using a simple command line syntax. The latest release now supports the definition of channel groups, connection counting, and handling. Boosting the power, and versatility of balance, one big step further.

GNU-Radius is a server for remote user authentication and accounting. Its primary use is for Internet Service Providers, though it may also be used on any network that needs a centralized authentication and/or accounting service for its workstations. The package includes an authentication and accounting server and administrator tools.

Grsync is a GUI (Graphical User Interface) for rsync, the commandline directory synchronization tool. It makes use of the GTK libraries and is released under the GPL license, so it is opensource. It doesn't support all of rsync features, but can be effectively used to synchronize local directories and supports remote targets in a limited way (read: manual).

From the website: ldap2dns is a program to create DNS (Domain Name Service) records directly from a LDAP directory. ldap2dns is designed to write ASCII data files used by tinydns from the djbdns package, but also may be used to write .db-files used by named as found in the BIND package.

tcpflow is a program that captures data transmitted as part of TCP connections (flows), and stores the data in a way that is convenient for protocol analysis and debugging. Each TCP flow is stored in its own file. Thus, the typical TCP flow will be stored in two files, one for each direction. tcpflow can also process stored 'tcpdump' packet flows.

NetStrain is a tool to measure practical data throughput between two machines over a TCP connection. It can be used for performance testing, stress/stability testing and to demonstrate various network effects. It supports both IPv4 and IPv6, provided the underlying system does.

Netwib is a network library providing : - network features : + address conversion + UDP/TCP clients/servers + packet encoding/decoding/displaying + spoofing + sniffing + etc. - and general features : + data conversion + linked list, hash + portable threads + etc. Using all these functions, a network program can be quickly created.

Nifmon is a curses-based tool for FreeBSD which can be used to monitor network interfaces (also tun devices). It displays continously updated statistics for the following quantities: - total amount of bytes/packets transferred in/out - bytes/packets transferred in/out during the last second/minute/hour - a stripped down tcpdump output You will need super-user permissions in order to use nifmon.