Here is a blog post putting the latest information about ArcaOS 5.1 into context. The Return of OS/2: Exploring ArcaOS 5.1
If you are looking for an for testing purposes, you can search for "open-source OS/2 clone" to find projects like Arca-Noae's ArcaOS which provide open-source components, though you will miss the proprietary OS/2 Kernel and GUI. arcaos 51 download free
: Available in multiple localized languages with standardized installer routines. Here is a blog post putting the latest