That&#x27;s probably mostly it. Plan 9 doesn&#x27;t really have that much in terms of features. It&#x27;s greatest strength is in how they go together. Having <i>everything</i> as a file is about the only thing I can think of that unixes don&#x27;t have (which is the most important, yet not initially clearly how, feature).
Oh, and on the programming end maybe the simplified api and CSP based threads&#x2F;concurrency library.