I am a great enthusiast of free and open source OSes .
Like:
GNU/Linux:
Since it's a Unix clone it's stable. It has great potential but lacks the FreeBSD-style documentation.
Freebsd:
since its based on Unix its ridiculously stable . It has great potential but lacks the
user-friendly installer and eye candy looks .
Freedos:
it is a MS Dos clone .
React OS:
It is in development (version 0.312) it mimics the Windows in every possible way and is compatible with windows apps/drivers . But it has better security . good for those who are average users known only to windows .
Open solaris/open indiana :
I haven't used these so can't say anything about those .
share your experience / views
and please add if you know some other OS(es) which I didn't' mention here .
I would love to know about other ones .
thank you