Synonyms for Stand-alone:

n.

asynchronous, compatibility, backward-compatible, bursty, best-of-breed, clickable, active, compatible, case-sensitive, Antivirus. separate, independent, do with, in isolation, as distinct from, discrete, fragmentary, unconnected, unrelated. •stand-alone (noun)
complete.

Other synonyms:

fragmentary, discrete. unrelated, unconnected. do with. independent. separate. •Other relevant words:
discrete, fragmentary, unrelated.