It's meant to be a pun for "kitchen sink," and also to work with the notion of "sync"-ing. It's pronounced like "sink." Cinc is the number 5 in Catalan and refers to the amount of senses we use when cooking.
I retract my criticism then! Also, it seems I should have read the About page. Might I suggest adding it to the top navigation? I think some further explanation/self promotion (especially as you've written it) is warranted.
edit: Also should have known. "Cinq" is five in French as well.
My one criticism right off the bat is the name -- the pronunciation isn't immediately obvious. ("Sink?", "Kink?", "Kins?", "Since?")
Then again, I don't know if that's just me...