where are the worthwhile markdown dingi?

[Bowerbird at aol.com]

where are the worthwhile markdown dingi?   (dinguses?)

i'm interested in any dingus that can take a "reasonable"
amount of text -- let's say anything up to a megabyte --
and return the results in real-time, without a long wait...

ideally it'd handle something more than gruber-minimum,
and an a.p.i. (that'd take a u.r.i. as input) would be dandy...
bonus points for additional output (i.e., .epub, .mobi, .pdf).

-bowerbird
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