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[991 users on Ohloh]
rsync is an open source utility that provides fast incremental file transfer.
Nmap Security Scanner
[513 users on Ohloh]
Nmap ("Network Mapper") is a free open source utility for network exploration or security auditing. It was designed to rapidly scan large networks, although it works fine against single hosts. Nmap uses raw IP packets in novel ways to determine what hosts are available on the network, what services (application name and version) those hosts are offering, what operating systems (and OS versions) they are running, what type of packet filters/firewalls are in use, and dozens of other characteristic...
BIND (Berkeley Internet Name Domain)
[382 users on Ohloh]
BIND (Berkeley Internet Name Domain) is an implementation of the Domain Name System (DNS) protocols and provides an openly redistributable reference implementation of the major components of the Domain Name System, including a Domain Name System server, a Domain Name System resolver library and tools for verifying the proper operation of the DNS server.
The tcpdump project
[335 users on Ohloh]
Tcpdump prints out the headers of packets on a network interface that match the boolean expression.
GNU netcat
[203 users on Ohloh]
Netcat is a featured networking utility which reads and writes data across network connections, using the TCP/IP protocol.

It is designed to be a reliable "back-end" tool that can be used directly or easily driven by other programs and scripts. At the same time, it is a feature-rich network debugging and exploration tool, since it can create almost any kind of connection you would need and has several interesting built-in capabilities.

[97 users on Ohloh]
Twisted is an event-driven networking framework written in Python. It integrates a large number of consistent APIs for developing new Internet services.
[65 users on Ohloh]
Cacti is a complete network graphing solution designed to harness the power of RRDTool's data storage and graphing functionality. Cacti provides a fast poller, advanced graph templating, multiple data acquisition methods, and user management features out of the box. All of this is wrapped in an intuitive, easy to use interface that makes sense for LAN-sized installations up to complex networks with hundreds of devices.
[65 users on Ohloh]
Unison is a file-synchronization tool for Unix and Windows, written in OCaml. It allows two replicas of a collection of files and directories to be stored on different hosts, modified separately, and then brought up to date by propagating the changes in each replica to the other.
Unison offers several advantages over various synchronization methods such as CVS, Coda, rsync, Intellisync, etc. Unison can run on and
synchronize between Windows and many UNIX platforms. U...
[54 users on Ohloh]
OpenWrt is described as a Linux distribution for embedded devices.

Instead of trying to create a single, static firmware, OpenWrt provides a fully writable filesystem with package management. This frees you from the application selection and configuration provided by the vendor and allows you to customize the device through the use of packages to suit any application.

[49 users on Ohloh]
mtr combines the functionality of the 'traceroute' and 'ping' programs in a single network diagnostic tool.
[49 users on Ohloh]
PF (Packet Filter) is OpenBSD's system for filtering TCP/IP traffic, doing Network Address Translation, normalizing and conditioning TCP/IP traffic and providing bandwidth control and packet prioritization.

PF has also been ported to FreeBSD, NetBSD, and DragonFly BSD, and is an integral part of MirBSD.

[29 users on Ohloh]
Tags: network bind resolver dns djb networking
Small, secure dns cache and resolver written by Daniel J. Bernstein, the author of qmail. djbdns is extremely fast, very secure and easy to configure (think 'opposite of bind zone files').
[27 users on Ohloh]
Iproute2 is a collection of utilities for controlling TCP / IP networking and traffic control in Linux.
[24 users on Ohloh]
Tags: resolver networking dns network
Dnsmasq is a lightweight, easy to configure DNS forwarder and DHCP server. It is designed to provide DNS and, optionally, DHCP, to a small network. It can serve the names of local machines which are not in the global DNS. The DHCP server integrates with the DNS server and allows machines with DHCP-allocated addresses to appear in the DNS with names configured either in each host or in a central configuration file. Dnsmasq supports static and dynamic DHCP leases and BOOTP/TFTP for network booting...
[23 users on Ohloh]
grml is a bootable CD (Live-CD) originally based on Knoppix and nowadays based on Debian. grml includes a collection of GNU/Linux software especially for users of texttools and system administrators.
grml provides more than 2500 software packages! Excluding library stuff, more than 1700 packages remain. We don't ship KDE and OpenOffice, but more than 800 packages which Knoppix does not provide. You'll get sysadmins favourite tools, security- and network-related software, data recov...
[20 users on Ohloh]
The Shoreline Firewall, more commonly known as "Shorewall", is a high-level tool for configuring Netfilter. You describe your firewall/gateway requirements using entries in a set of configuration files. Shorewall reads those configuration files and with the help of the iptables utility, Shorewall configures Netfilter to match your requirements. Shorewall can be used on a dedicated firewall system, a multi-function gateway/router/server or on a standalone GNU/Linux system. Shorewall does not use ...
Scorched 3D
[19 users on Ohloh]
Scorched3D is a cross-platform 3D remake of the popular 2D artillery game Scorched Earth. Scorched3D can be played against the computer, other players, and remotely across the Internet or LAN.
[18 users on Ohloh]
The PowerDNS daemon is a versatile nameserver which supports a large number of backends. These backends can either be plain zonefiles or be more dynamic in nature. Additionally, through use of clever programming techniques, PowerDNS offers very high domain resolution performance.
Prime examples of backends include relational databases, but also (geographical) loadbalancing and failover algorithms.
[14 users on Ohloh]
Cobbler is a Linux installation server that allows for rapid setup of network installation environments.

With a simple series of commands, network installs can be configured for PXE, reinstallations, media-based net-installs, and virtualized installs (supporting Xen, qemu, KVM, and VMware Server). Cobbler uses a helper program called 'koan' (which interacts with Cobbler) for reinstallation and virtualization support.

Cobbler can also optionally help with managing DHCP, DNS, power, co...

Endian Firewall
[14 users on Ohloh]
Endian Firewall Community is a "turn-key" linux security distribution that turns every system into a full featured security appliance with Unified Threat Management (UTM) functionality. The software has been de signed with "usability in mind" and is very easy to install, use and manage, without losing its flexibility. The features include a stateful packet inspection firewall, application-level proxies for various protocols (HTTP, FTP, POP3, SMTP) with antivirus support, virus and spamfiltering ...