OS (Operating System)

The OS Files
Your one-stop portal for all operating systems that run on the x86 platform.

Debian GNU/Linux
Free OS under GNU General Public License

Linux
    Red Hat Linux Desktop, Workstation and Server

Mac OS

Microsoft Windows
Windows 9x, NT, 2000, XP, Vista, 7

OS/2 Warp
Server & Client, Client Supports OS/2, DOS, Java and most Windows 3.X applications

RISC OS
for RiscPC

UNIX
Networking Workstation and Server

See also Network OS Server
Many Network OS Server software vendors offer desktop OS or can be used as as a powerful desktop OS.

Multiple OS, Virtual Computer

DIY

Multiple OS Booting in Windows
How to multiple boot Windows XP, Windows 2000, Windows NT, Windows 95, Windows 98, Windows Me, and MS-DOS
How to Install Windows 95, Windows 98, or Windows Me in a Windows XP, Windows 2000, and MS-DOS, or a Windows NT and MS-DOS Multiple-Boot Configuration

How to create a multiple-boot system in Windows XP

Boot Options in Windows Vista and Later

Software

HyperOS
Run several copies of Windows 2K and XP and Vista on the same PC and swap between them with a double click.

Microsoft Virtual PC
Microsoft Virtual PC 2007 is free

VMware Workstation
Virtual machine enabling multiple operating systems to run on a physical computer VMware Workstation for Windows, VMware Workstation for Linux, VMware ThinApp. Free download Fully-functional evaluate version.

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Network OS / Server

ServerWatch
News, Trends, Tutorials, Stats, Hardware, Software, Server & OS directory, Reviews ....

FreeBSD
The Berkeley Software Distribution (BSD) version of the Unix operating system. FreeBSD is an alternative to Linux that will run Linux applications.

Mac OS X Server
Apache Web Server included

Microsoft Windows 2000 Server with IIS 4 / 5
Microsoft Windows Server 2003 with IIS 5 / 6
Microsoft Windows Server 2008 with IIS 7 / 7.5

NetBSD Latest release v4.0
NetBSD is a free, secure, and highly portable Unix-like Open Source operating system available for many platforms, from large-scale server systems to powerful desktop systems to handheld and embedded devices.

Novell NetWare
NetWare v6.5 and the Novell Open Enterprise Server v2 based on SUSE Linux Enterprise Server 10 with Apache Web Server, Tomcat Servlet Engine, MySQL, support for Perl, PHP, FTP, SOAP Server, UDDI Server, DNS/DHCP Servers and XEN Virtual Machine.

Red Hat Enterprise Linux Server
Current release v5 includes full suite of open source server applications, including: Apache, Samba, nfs, ftp, Tomcat, MySQL, PostgreSQL and network servers.

OpenBSD
A free, multi-platform 4.4BSD-based UNIX-like operating system supports binary emulation of most programs from SVR4 (Solaris), FreeBSD, Linux, BSD/OS, SunOS and HP-UX.

Sun Solaris OS Environment
Latest release v8 for SPARC (32- and 64-bit) or Intel Architecture (32-bit) x86 Platform.

UNIX 98 Server
Support Internet and intranet services

Ubuntu
A community developed, Linux-based operating system that is perfect for laptops, desktops and servers. It contains all the applications you need.

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Database Server

Firebird
Firebird is a relational database offering many ANSI SQL standard features that runs on Linux, Windows, and a variety of Unix platforms and its free.

IBM Informix Data Servers
IBM Informix data servers are known worldwide for being exceptionally easy to manage while maintaining high availability and blazing online processing capabilities.

Microsoft SQL Servers
    Free Microsoft SQL Server Desktop Engine (MSDE)
        for most Microsoft OS/Server except Vista
    Microsoft SQL Server 2005 Express Edition

MySQL
the world's most popular open source database, it's also become the database of choice for a new generation of applications built on the LAMP stack (Linux, Apache, MySQL, PHP / Perl / Python.) MySQL runs on more than 20 platforms including Linux, Windows, OS/X, HP-UX, AIX, Netware.

Oracle
Oracle Application Server and Oracle Database

PostgreSQL
PostgreSQL is a powerful, open source relational database system. It runs on all major operating systems, including Linux, UNIX (AIX, BSD, HP-UX, SGI IRIX, Mac OS X, Solaris, Tru64), and Windows. It has native programming interfaces for C/C++, Java, .Net, Perl, Python, Ruby, Tcl, ODBC.

Sysbase
Database Management and Servers

Fax Server

Fax Server

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FTP Client

About FTP

AceFTP2 Client for Windows free trial

BulletProof FTP for Windows free trial

CuteFTP for Windows

Fetch FTP client for the Apple Mac

FileZilla - free FTP client for all platforms.

FTP Explorer for Windows

FTP Voyager for Windows

IglooFTP Graphical FTP Client for Linux

JFTP the FTP Client for Java
A cross-platform graphical FTP runs on any platform that supports Java 1.1, and has been tested on Windows 95, 98, NT 4.0, Linux, MacOS and Sparc and Intel Solaris platforms, connecting to NT and UNIX based FTP servers.

NFTP FTP client for - AIX RS/6000 / BeOS Intel / Digital Unix Alpha / FreeBSD Intel / Linux Intel, SPARC / OS/2 Intel / Solaris SPARC, Intel / Windows 95/98/NT/2000

SmartFTP for Windows.

Terrapin FTP Client

Top rating FTP Client list

Transmit FTP for Mac

WS_FTP

More FTP Client

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FTP Server

FileZilla FTP server
Open source software distributed under the terms of the GNU General Public License

ProFTPD
Highly configurable GPL-licensed FTP server software

Rumpus
FTP Server for Mac OS

Terrapin File server

WS_FTP Server

Search for FTP server software

Messaging / Mail Server

CommuniGate Pro
Based on open standards, CommuniGate Pro provides an integrated platform for Store-and-Forward (E-mail, Calendaring) and Real-Time (VoIP, Video, Instant Messaging, White Boards) communications over IPv4 and IPv6 networks.

EIMS Eudora Internet Mail Server
for the Macintosh platform

Eudora WorldMail Server for Windows

FTGate Mail Server for Windows servers

GFi Security & Messaging Software

Gordano Mail server for the Windows and Unix platforms. WebMail Server, GMS Collaboration Server and Instant Messenger (IM)

IMail Server
Commercial Grade Mail Server

inFusion Mail Server
Commercial Grade Mail Server

MailSite Fusion
Easy to use and secure business email and calendar server software. Free & Enterprise versions .

Mdaemon
A full-featured Email Server software by Zen Software.

Microsoft Exchange Server
Commercial Grade Mail Server.

Post.Office
Scalable SMTP/POP3/IMAP messaging server for Mac OS X

PostCast SMTP Server
PostCast Server is an SMTP mail server program that completely replaces your ISP's SMTP server. By making one small change in your e-mail program, you can start sending messages directly from your computer

Qpopper
POP3 server for Unix/Linux. Mac OS X compatibility.

SL Webmail
from Seattle Lab

Software602 Groupware Server
Secure messaging solution with web collaboration contains SMTP/IMAP/LDAP services ...

SurgeMail Mail Server
Secure, antispam, antivirus. Supports IMAP4, SMTP, POP3, SSL, HTTP on Windows, UNIX ( Linux, Solaris etc.), Mac OSX, FreeBSD

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Proxy Server

General Knowledge

What is a proxy server and how it works?

Software

Internet Gateway
For Windows and Mac

Microsoft ISA Server
Microsoft Internet Security and Acceleration (ISA) Server 2006 has replaced ISA Server 2004, ISA Server 2000, and Microsoft Proxy Server.

Squid Web Proxy Cache
Free - an open-source Proxy Server Software

WinGate Poxy Server with built-in Firewall

Search for Proxy Server software

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Web Server Software

General Knowledge

How Web Servers Work?
Web Server list and comparision

Software

AnalogX SimpleServer:WWW A simple to use yet powerful server

AOLserver
AOLserver is America Online's Open-Source web server.

Apache Web Server
A freely-available source code implementation of an HTTP (Web) server, the most widely used Web server software in the world

BadBlue Web Servers
Personal Edition (PE): turns your PC into a web server. Enterprise Edition (EE) for Business Application

Boa http server
Free - a server software distributed under the GNU General Public License

CERN httpd (W3C httpd)
Free - A generic public domain full-featured hypertext server which can be used as a regular HTTP server. It can also serve as a proxy - a server on a firewall machine.

GoAhead WebServer
Open source Web Server, royalty free license and commercial license.

Jigsaw
Free - W3C's leading-edge Web server platform, providing a sample HTTP 1.1 implementation and a variety of other features on top of an advanced architecture implemented in Java.

Mathopd
A very small, very fast HTTP server for UNIX systems

Microsoft Commerce Server
Commercial Grade Web Server for eCommerce site development & management, trial download available

Microsoft IIS (Internet Information Service)
IIS is supplied with Microsoft Windows Operating Systems
IIS 5.1 supplied with XP Pro
IIS 6.0 supplied with Vista Home Premium and higher
IIS 7.0 supplied with Windows 7 professional and higher
see Microsoft Network Servers with IIS

Red Hat Stronghold Enterprise Secure Web Server
Commercial Grade SSL Secure 128-bit encryption Web Server based on the popular Apache web server.

Savant Web Server
Free - open source web server that runs on Windows 95, 98, ME, NT, and 2000, turning any desktop computer into a powerful web server.

Zeus Web Server
Hosting / Commercial Grade high-performance web server software