FSN was a real, although experimental, viewer.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Fsn" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Fsn</a><p>There was FSV which was an open source version, and there&#x27;s a newer version discussed here: <a href="http:&#x2F;&#x2F;www.phoronix.com&#x2F;scan.php?page=news_item&amp;px=MTg4MTk" rel="nofollow">http:&#x2F;&#x2F;www.phoronix.com&#x2F;scan.php?page=news_item&amp;px=MTg4MTk</a><p>EDIT:<p>&gt; It&#x27;s also worth bringing up a project with similar aim which was Sun&#x27;s Project Looking Glass and powered by Java but that Java 3D desktop has been canned for many years now.<p>Holy moly this is <i>terrifying</i>.