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On the topic of Haiku as a dead OS. I'd seriously disagree. I have a machine here that's set up to technically triple boot Linux (Ubuntu), Windows, and Haiku. To be honest, i use Haiku the most out of the three. In it's current state, it's more than usable.
Syllable is interesting, and REBOL is very powerful and can produce some fantastic stuff if you learn it. I personally don't code REBOLm, but i know someone who's pretty good at it (He should be, he's the son of the creator of REBOL XD )