Enterprise
Liferay Enterprise Portal is a Java/J2EE portal system that provides personalization (like Yahoo.
More Info 
Developer: Liferay Developers
License: MIT/X Consortium License
Operating System: UNIX, Win NT, XP, Linux
Supplies barcode software like enterprise barcode generator and picture creator.
Developer: Barcode Generator
License: GNU General Public License (GPL)
Operating System: Not Available
Nuxeo Enterprise Platform (Nuxeo EP) is the underlying content management foundation behind the range of content applications offered by Nuxeo and the Nuxeo Galaxy Partner community.
Developer: Nuxeo
License: GNU Lesser General Public License (LGPL)
Operating System: Java EE-based platform
Enterprise Content Management (ECM) has matured into a core infrastructure requirement for organizations in today’s knowledge economy.
Developer: Gopi Patel
License: GNU Lesser General Public License (LGPL)
Operating System: Not Available
It is a web based program that makes creating personal, corporate, or organizational and enterprise portal possible.
Developer: CEBITCO
License: GNU General Public License version 3.0 (GPLv3)
Operating System: Windows, Linux, MacOS
Enterprise Timesheet And Payroll is a multi-platform compatible project to build a multi platform, multi lingual, web based timesheet and payroll systems using PHP and MySQL.
Developer: http://epayroll.sourcefo...
License: Freeware
Operating System: Unix/Linux/Windows
AlligatorSQL Enterprise Edition is Windows compatible.
Developer: http://www.alligatorsql....
License: Freeware
Operating System: Windows
iPlanet Web Server, Enterprise Edition is multi-platform compatible.
Developer: RF
License: Freeware
Operating System: All
FileUp Enterprise Edition (FileUpEE) addresses the most complex needs of any secure file transfer application.
Developer: jeff gutridge
License: Freeware
Operating System: Windows
NagMIN is a enterprise class Network Monitoring System, Powered by Nagios, WebMIN, RRDtool, Nmap, Fping, Net::SNMP, Syslog-NG and other open source software providing web-based administration, and enhanced web portal to help you manage your network.
Developer: NagMIN - Network Monitoring System
License: GNU General Public License (GPL)
Operating System: Platform Independent
Caravel is a enterprise-level Content Management System with an intuitive user interface, designed to allow non-technical users to maintain website content.
Developer: Caravel CMS
License: GNU General Public License (GPL)
Operating System: Linux
RT is an enterprise-grade ticketing system which enables a group of people to intelligently and efficiently manage tasks, issues, and requests submitted by a community of users.
Developer: Best Practical Solutions LLC.
License: GNU General Public License (GPL)
Operating System: POSIX
Oneit Software Solutions The Leading Provider of Enterprise Management Software and have a passion to create innovative software and empower business.
Developer: seooneit
License: GNU General Public License (GPL)
Operating System: Not Available
Emagine is a Belgium based ICT company, founded in the year 2000, that focuses on the development of a cost-efficient and user-friendly Enterprise Content Management System emagiC CMS.
Developer: Emagine
License: Freeware
Operating System: Windows
Clearly Advanced CMS:An enterprise class knowledge management system using PHP.
Developer: Steve Tchorzewski
License: Freeware
Operating System: Linux
MyComputer.
Developer: http://www.mycomputer.co...
License: Freeware
Operating System: All
Enterprise strength, high performance, super fast metasearch engine.
Developer: BizNetic Solutions
License: Freeware
Operating System: linux, windows, freebsd, sun
TYPO3 is a free Open Source content management system for enterprise purposes on the web and in intranets.
Developer: TYPO3
License: GNU General Public License (GPL)
Operating System: Unix, Windows (any)
Collaborative Portal Server (CPS) is the most complete Open Source platform available for building Enterprise Content Management (ECM) applications.
Developer: CPS
License: GNU General Public License (GPL)
Operating System: Linux/Unix/MacOS/Windows
jLibrary is a DMS (Document Management System), oriented for personal and enterprise use.
Developer: Martín Pérez Mariñán & others
License: BSD License
Operating System: OS Independent (Written in an interpreted language)