"Microsoft and others use the term “release to manufacturing" (RTM) to refer to this version (for commercial products, like Windows XP, as in, “Build 2600 is the Windows XP RTM release“), and “release to Web" (RTW) for freely downloadable products." 
In other words, it is right before the production phase of the software development life cycle. Nevertheless, if it is RTW or 'released to the web' it may be available for downloading on the web somewhere for no cost to all users. If it is a product such as an open source software product, meaning it is free to all.
If it were a CD, only then it would go to the manufacturer and be processed with label and branding. It is priced and boxed, ready to be on display in a store. This boxed copy complete with all packaging frills, is the general availability release.
That overall is a brief overview of the software development life cycle for most products. If you own some type of software program such as your computer's operating system, most likely your OS went through these stages even if it is an open source product, such as UNIX or Linux.