1. FreeBSD :
FreeBSD is a free and open source
operating system which is provided The FreeBSD Project. It was designed on the basis of the two Unix-like operating systems Berkeley Software Distribution (BSD) and Research
Unix. It has quite similarities with Linux operating system. It was one of the famous operating systems earlier but now it is less used as compared to other operating systems. The first version of FreeBSD was launched in 1993. The latest stable version of FreeBSD is 12.1.
2. OS/2 :
OS/2 is a series of operating system which was developed by co-ordination of Microsoft Incorporation and IBM. Its target systems are personal computers and servers. It is written using C, C++ and assembly language. The first version of OS/2 was launched in 1987. It was discontinued in 2006 and after that it was being updated, maintained and marketed under the name eComStation. In 2015 it was named ArcaOS. The kernel used in this operating system is Monolithic with modules.
Difference between OS/2 and FreeBSD :
