eComStation 2.2 is scheduled for release in October 2015 from the new developer XEU, which has taken over from Mensys BV, the previous maintainer of the project. eComStation is the successor to IBM's OS/2, with updated driver support and current software packages such as Firefox and Apache OpenOffice.org. Despite the relative age of OS/2, it still has vibrant community support.
Killer feature: Full binary compatibility for Win16 applications (this is better than the compatibility in Windows).
Price: $145 for the Home/Student edition.
Image: XEU.com BV