Open source is here to stay: Here's how to start dealing with it.

Compiled by Chris Lindquist

• What is open source?
• Why use open source?
• Why not to use open source
• How should I get started with open source?
• What about open source on the desktop?
• Can I sell open source-based products?
• Other open-source resources

The success of open-source software has been remarkable, forcing even the largest commercial software vendors such as IBM , Hewlett-Packard , Oracle and Microsoft to acknowledge its influence and, in some cases, adopt its methods. It seems likely that most companies with information technology departments of any size are familiar with—if not actively using—open-source products on a daily basis.

But its ubiquity can lead to more questions than answers. Here, therefore, are the answers:

What is open source?

Back in 1997, Bruce Perens, a prominent Linux operating system developer, wrote a document concerning the distribution and development of the Debian Linux distribution. He later removed references to Debian and created what is now known as The Open Source Definition. Among other things, the Definition states that open source software must be distributed without royalty, that the distributor must make the source code for the software freely available, and the derivative works from the code must also be released as open source.

Open source is essentially a cousin of the Free Software Movement, created in 1983 by Richard Stallman to promote the free distribution of software unfettered by standard proprietary code restrictions. Free software's rules are codified by the General Public License (GPL), which as of October 2006 was under review for its third revision.

There are literally dozens of Open Source Initiative certified licenses, each with its own peculiar rules that require close examination by any company looking to use open-source software. These rules are usually quite generous for anyone who merely wishes to use open source software. The requirements for redistribution, however, can require careful scrutiny to avoid potential license violation issues.

Why use open source?

The first reason many companies begin looking at open-source software is simple: price. And the return on investment of the open-source model has been clearly demonstrated. Open-source software can be downloaded, installed and operated free of charge. In its early days, this low cost made it a tempting option for developers interested in trying new tools or building new applications but without the budget to do so. This freedom led many developers to start contributing to the open-source movement, resulting in such industrial-grade software as the Linux operating system, Apache Web server, JBoss Java application server and Eclipse development environment—among thousands of other projects.

It wasn't until the late 1990s, however, that corporations began noticing open source at the executive level. With developers touting the quality and cost savings of using open source, and with IT budgets under constant pressure, many large companies began investigating open source for enterprise projects. Early large-scale adopters included The Weather Channel, Cendant Travel, and Employease and Sabre.

Especially during the heavy growth of the Internet, open source let companies quickly ramp up their online operations without the need to constantly buy new licenses for commercial software. This scalability also lent itself to development and test environments, reducing the cost to simply try new things without the added drag of commercial software pricing—and the mandatory budgetary process—getting in the way.

Perhaps not surprisingly, the fact that the source code is available for open-source products is usually not a big draw. While having the right to modify or fix code at will is certainly seen as a plus, many companies find that they'd rather not get into the habit of maintaining the code themselves, instead depending on the community of developers that exists around popular products to keep the code up to date and debugged.

Why not to use open source

The arguments against open source generally boil down to a handful.

1. The software is free as in "free puppy." You can download and install it for free, but training users on it and maintaining it can ultimately cost more than the overall cost of commercial software, or so the argument goes. This claim, trumpeted perhaps most loudly by Microsoft, does carry some intuitive weight. Whether it's true or not depends on the specific situation and which analyst report you happen to be reading at the time.
2. Support can be hard to come by. In the early days of open source, when development and support were handled primarily by groups of volunteers or "communities," this could be an issue. But while many organizations find that community support is sufficient for their needs, today there are numerous support options available, including support for major open-source projects from the likes of Hewlett-Packard and IBM, giving corporations the much-valued "one throat to choke" should something go wrong.
3. Development of new features takes longer than with commercial software. This depends largely on the type of software you're using. The Firefox Web browser, for instance, is touted as a first-rate example of the speed at which open source can adapt to user needs. Linux's past history of coming in well behind Windows to support technologies such as USB ports demonstrates the other extreme. For enterprise-class software, however, such slavish attachment to the latest and greatest video card or sound chip is likely not as critical as stability and performance.
4. The legal ramifications are uncertain. The variety of open-source licenses and the fact that open-source code is often contributed by end users of the products would seem to make it a scary proposition for use in corporations. But a careful review of open-source licenses with your corporate legal representation can alleviate many of the fears. Some open-source vendors and third parties also offer indemnification against damages, should open-source code you use become embroiled in a lawsuit.