OpenSource (ACT) is not just Linux, as many are accustomed to think.
ACT may knock on your door even if you have on your computer Windows.
Windows OpenPack (Soft) - a collection of software (OSS) for Windows. It includes the wonderful programs for a wide range of tasks that are functional equivalents of expensive software (such as MS Office, graphics and music editors,archivers, Internet browsers, layout and design, etc.