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Syllable, like pretty much any hobby os, is dead. The only ones surviving are either supported by corporations - Windows, Os X, QNX, Symbian, Android, Solaris, either supported by big comunities - Linux(es), FreeBSD, OpenBSD, OpenIndiana.
But Syllable, SkyOS, Haiku, Menuet, ReactOS, are pretty much dead.
While 30 years ago a single guy could sit in front of his computer and write something like DOS or Minix in a year, writing something comparable to Windows, Os X or Linux in complexity requires pretty big resources.