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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...

OpenSSL
[1072 users on Ohloh]
The OpenSSL Project is a collaborative effort to develop a robust, commercial-grade, full-featured, and Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as a full-strength general purpose cryptography library. The project is managed by a worldwide community of volunteers that use the Internet to communicate, plan, and dev
GnuPG
[785 users on Ohloh]
GnuPG is the GNU project's complete and free implementation of the OpenPGP standard as defined by RFC2440 . GnuPG allows to encrypt and sign your data and communication, features a versatile key managment system as well as access modules for all kind of public key directories.
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)

WinSCP
[483 users on Ohloh]
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.
Postfix
[465 users on Ohloh]
Postfix is Wietse Venema's mailer that started life as an alternative to the widely-used Sendmail program. Postfix attempts to be fast, easy to administer, and secure, while at the same time being sendmail compatible enough to not upset existing users. Thus, the outside has a sendmail-ish flavor, but the inside is completely different.
SpamAssassin
[381 users on Ohloh]
SpamAssassin is a spam filter that can be used on a wide variety of email systems including procmail, sendmail, Postfix, qmail, and many others.
Clam AntiVirus
[286 users on Ohloh]
Clam AntiVirus (ClamAV) is an anti-virus toolkit for Unix. The main purpose of this software is the integration with mail servers (attachment scanning). The package provides a flexible and scalable multi-threaded daemon, a commandline scanner, and a tool for automatic updating via Internet. The programs are based on a shared library distributed with the Clam AntiVirus package, which you can use in your own software.
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...
FUSE
[241 users on Ohloh]
Filesystem in Userspace is a simple interface for userspace programs to export a virtual filesystem to the Linux kernel. It also aims to provide a secure method for non privileged users to create and mount their own filesystem implementations.
AWStats
[205 users on Ohloh]
Advanced Web Statistics (AWStats) is a free powerful Web server logfile analyzer (Perl script) that shows you all your Web statistics including visits, unique visitors, pages, hits, rush hours, search engines, keywords used to find your site, robots, broken links, and more. It works with both IIS 5.0+ and Apache Web server log files as a CGI and/or from the command line. It also supports multiple languages including English, French, Dutch, Spanish, Italian, German, Polish, and Greek.
Plone
[140 users on Ohloh]
Plone is a ready-to-run content management system that is built on Python and the Zope application server. Plone is easy, flexible, and gives you a system for web content that is ideal for projects, communities, websites and intranets.
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...
TrueCrypt
[117 users on Ohloh]
On-the-fly encryption software which can create a virtual encrypted disk within a file and mount it as a real disk. It can also encrypt a hard disk partition or storage device, such as USB flash drive. Moreover, TrueCrypt supports plausible deniability.
GnuTLS
[115 users on Ohloh]
GnuTLS is a project that aims to develop a library which provides a secure layer, over a reliable transport layer.
iptables
[89 users on Ohloh]
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.
Acegi Security System for Spring
[87 users on Ohloh]
A comprehensive security module for The Spring Framework. Delivers authentication, authorization, security interception, and run-as authentication replacement. Extensive use of well-targeted interfaces facilitate easy customisation by developers.
OpenBSD
[74 users on Ohloh]
The OpenBSD project produces a FREE, multi-platform 4.4BSD-based UNIX-like operating system... efforts emphasize portability, standardization, correctness, proactive security and integrated cryptography. OpenBSD supports binary emulation of most programs from SVR4 (Solaris), FreeBSD, Linux, BSD/OS, SunOS and HP-UX.
FreeBSD Ports
[72 users on Ohloh]
The FreeBSD Ports and Packages collection is used to install and manage software on the FreeBSD operating system.