Some free and open-source projects come with commercial-support. Usually a subscription based service is sold offering 24/7 helpdesks and full-time developers who help modifying the system to individual business needs.
The SourceLabs SASH stack for Java is a stack of lightweight enterprise app frameworks that deploy on a J2EE application server or other Java container. J2EE application standards define system services like transactions, security, messaging, etc. Commercial vendors have focused on providing the best qualities of service for these system services but not addressed application frameworks.
While developers can build applications directly against the J2EE APIs, frameworks drastically reduce the amount of infrastructure code needed for

The SASH stack integrates open source projects to provide these capabilities in a complete package that minimizes the need for homegrown frameworks. SASH consists of
SASH is available on various application server containers, and can also be downloaded from SourceLabs with Tomcat, providing a complete web application platform.
SASH
Java
J2EE
License:BSD
Struts
Hibernate
Web
Spring
Application
commercial-support
xt-commerce is a distribution of osCommerce which is sold with commercial support.
oscommerce
PHP
open-source
ecommerce
support
commercial
shop
commercial-support
SuSE is a Linux Distribution that is now distributed by Novell.
SourceLabs provides a Self-Support Suite of tools for SUSE
linux
novell
Linux-distribution
SourceLabs
SuSE
support
commercial-support
self-support
SmoothWall Express is an open source firewall distribution based on the GNU/Linux operating system. SmoothWall includes a hardened subset of the GNU/Linux operating system, so there is no separate OS to install. Designed for ease of use, SmoothWall is configured via a web-based GUI, and requires little or no knowledge of Linux to install or use.
Security
linux
distribution
network
networking
firewall
commercial-support
Red Hat Linux is one of the first Linux distributions and has one of the largest market shares, particularly amongst US-based corporations.
Red Hat has since evolved into Fedora Core and Red Hat Enterprise Linux: the last release of Red Hat Linux was on March 31st, 2003.
SourceLabs provides a Self-Support Suite of Tools for RedHat Linux
RedHat
linux
Linux-distribution
SourceLabs
Fedora-Core
License:GPL
commercial-support
RedHat Enterprise Linux is an Enterprise Linux distribution provided by RedHat.
RedHat charges money for the binary distributions of RHEL, however in accordance with the GPL, they also offer the source code to the operating system.
Several projects have taken advantage of the source code to provide binary compatible distributions of RHEL, including the popular CentOS, WhiteBox Linux and others.
here is an easy guide to setting up CentOS 4.5. CentOS is binary compatible with RHEL.
Linux-distribution
Enterprise
RedHat
RHEL
commercial-support
OpenVista is the open-source version of VistA, which is an enterprise grade health care information system developed by the U.S. Department of Veterans Affairs (VA) and deployed at nearly 1,500 facilities worldwide.
.NET
EMR
vista
health
healthcare
work
gtk#
Medical
mono
commercial-support