I don't work for a big company, so this is purely speculation, but there could be many reasons why it's not done.<p>* Documentation Time<p>If you've got a big project, it could take weeks, even months to properly document some software to a position where it could be used by someone outside of the company. Sure you have your internal documentation but it can often be incomplete, or make assumptions that the person reading it knows about other bits of the company.<p>* Deployment<p>Big projects will often use very specialized hardware, software and environments, to the point where it could be nearly impossible to deploy outside of the company. It could depend on internal services that can't be open sourced because there still used, or are an important part of the business. Take Google Reader, yes it would be nice if it was open sourced, but internally it probably uses services, databases, APIs specialized just for Google, it's probably been optimized to work on Google's hardware, with their webserver, with their OS build etc.<p>Reddit is another example of this, Reddit's code is open source, and while it can be deployed, it's not easy. This seems mostly because it's been built to work on a very specialized set of software versions, and in a very specific environment. Larger open source projects tend to be tested on a multitude of environments, with applications only deployed or built internally, there's no point because you can very accurately control your environment.<p>* Some of the code is still used<p>Some, or even big chunks of the code could still be being used in current software. If you've got a library that's particularly useful, you might keep using it. If it works there's no point re-writing it just for a new project.<p>* The code is very bad<p>We all know it happens, a project contains terrible code, bad bugs and maybe even security issues, they never bothered getting fixed because they were never noticed. Given the opportunity to look through the code people might pick up on these issues and it would look bad on the company.<p>* Open source is complicated<p>Open source seems to come along with a whole host of fun things to deal with, GitHub issues, ranty blog posts, forks, copyright, licenses can all get a bit complicated. Even if it's old software that isn't used anymore you probably need to do some degree of management before things get too out of hand. Even a single tweet can have a big impact on a company, or a products reputation, so particularly at larger companies they'd probably want it managed in some way.<p>Anyone else got anything to add?