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PuTTY
[2048 users on Ohloh]
PuTTY is a free implementation of Telnet and SSH for Win32 and Unix platforms, along with an xterm terminal emulator. It also includes versions of sftp and scp.
OpenSSH
[1104 users on Ohloh]
OpenSSH is a free SSH/SecSH protocol suite providing encryption for network services like remote login or remote file transfer.

The following is a list of OpenSSH features:
* Open Source Project
* Free Licensing
* Strong Encryption (3DES, Blowfish, AES, Arcfour)
* X11 Forwarding (encrypt X Window System traffic)
* Port Forwarding (encrypted channels for legacy protocols)
* Strong Aut...

Wget
[997 users on Ohloh]
Tags: ssl gnu download http ftp networking cli https web
GNU Wget is a free software package for retrieving files using HTTP, HTTPS and FTP, the most widely-used Internet protocols. It is a non-interactive commandline tool, so it may easily be called from scripts, cron jobs, terminals without X-Windows support, etc.
FileZilla
[797 users on Ohloh]
FileZilla Client is a fast and reliable cross-platform FTP, FTPS and SFTP client with lots of useful features and an intuitive interface.

FileZilla Server is a reliable FTP server.

Common Unix Printing System (CUPS)
[634 users on Ohloh]
CUPS provides a portable printing layer for Unix(r)-based operating systems. It has been developed to promote a standard printing solution for all Unix vendors and users. CUPS provides the System V and Berkeley command line interfaces, and uses the Internet Printing Protocol ("IPP") as the basis for managing print jobs and queues. The Line Printer Daemon (LPD) Server Message Block (SMB), and AppSocket (a.k.a. JetDirect) protocols are also supported with reduced functionality. CUPS adds network p...
Wireshark
[587 users on Ohloh]
Wireshark is the world's foremost network protocol analyzer, and is the de facto (and often de jure) standard across many industries and educational institutions.

(Wireshark was known as Ethereal until June 09, 2006)

cURL
[520 users on Ohloh]
curl is a command line tool for transferring files with URL syntax, supporting FTP, FTPS, TFTP, HTTP, HTTPS, SCP, SFTP, TELNET, DICT, FILE and LDAP. curl supports SSL certificates, HTTP POST, HTTP PUT, FTP uploading, HTTP form based upload, proxies, cookies, user+password authentication (Basic, Digest, NTLM, Negotiate, kerberos...), file transfer resume, proxy tunneling and a busload of other useful tricks.
Nmap Security Scanner
[513 users on Ohloh]
Tags: networking monitor sysadmin netadmin network ping
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...
WinSCP
[483 users on Ohloh]
Tags: file-transfer networking ssh sftp scp security
WinSCP is a SFTP and SCP client for Windows using SSH. Its main function is secure copying of files between a local and a remote computer. Beyond this basic function, WinSCP manages some other actions with files. Plugin to FAR manager is available too.
BIND (Berkeley Internet Name Domain)
[382 users on Ohloh]
Tags: server network recursor networking dns bind
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.
Adium
[321 users on Ohloh]
Unified OS X instant messaging platform
OpenVPN
[259 users on Ohloh]
OpenVPN is a robust and highly configurable VPN (Virtual Private Network) daemon which can be used to securely link two or more private networks using an encrypted tunnel over the Internet. OpenVPN's principal strengths include wide cross-platform portability, excellent stability, support for dynamic IP addresses and NAT, adaptive link compression, single TCP/UDP port usage, a modular design that offloads most crypto tasks to the OpenSSL library, and relatively easy installation that in most cas...
GNU netcat
[203 users on Ohloh]
Tags: network server networking tool client gui console
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.

NetworkManager
[197 users on Ohloh]
Tags: gnome networking hal dbus linux
A laptop user should never need to use the command line or configuration files to manage their network; it should "Just Work" as automatically as possible and intrude as little as possible into the user's workflow. NetworkManager attempts to make networking invisible. When moving into areas you've been before, NetworkManager automatically connects to the last network the user chose to connect to.
Squid Cache
[137 users on Ohloh]
Tags: cacheproxyserver web med proxy networking cache
Squid is a high-performance proxy caching server for web clients, supporting FTP, gopher, and HTTP data objects. Squid handles all requests in a single, non-blocking, I/O-driven process.
Nagios
[130 users on Ohloh]
Nagios (formerly Netsaint) is a daemon written in C that is designed to monitor networked hosts and services. It has the ability to notify contacts (via email, pager or other methods) when problems arise and are resolved. Host and service checks are performed by external "plugins", making it easy to write custom checks in your language of choice. Several CGIs are included in order to allow you to view the current and historical status via a Web browser, and a WAP interface is also provided to al...
synergy-plus
[91 users on Ohloh]
Synergy lets you easily share a single mouse and keyboard between multiple computers with different operating systems without special hardware. It's intended for users with multiple computers on their desk since each system uses its own monitor(s). Just move the mouse off the edge of a screen to move to another screen; keyboard and mouse input is then redirected to the other screen. Synergy also lets you cut and paste between systems and it makes screen savers activate/deactivate in concert.
iptables
[89 users on Ohloh]
Tags: netfilter firewall security networking sysadmin
iptables is the userspace command line program used to configure the Linux 2.4.x and 2.6.x IPv4 packet filtering ruleset. It is targeted towards system administrators.
OpenSolaris
[77 users on Ohloh]
OpenSolaris is an open source project created by Sun Microsystems to build a developer community around the Solaris Operating System technology.