Minimac (http://freshmeat.net/projects/minimac-macro-processor) is a
minimalist, general purpose text macro processor.
It uses an explicit argument stack, and user functions are defined by
concatenation.
The software is currently in alpha release.

Example: 99 bottles of beer (http://99-bottles-of-beer.net/)

`drink! ( u -- ) `{continue}${#}
this-many-bottles of beer on the wall, this-many-bottles of beer.
Take one down and pass it around, fewer-bottles of beer on the wall.

{repeat}`

`oh-no! ( -- ) `No more bottles of beer on the wall, no more bottles of
beer.`

`please! ( u -- u ) `{#}
Go to the store and buy some more, this-many-bottles of beer on the wall.`

`this-many-bottles ( u -- u ) `[{dup} 0& ~no more bottles~& {case} 1& ~1
bottle~& {case} {.} ~ bottles~]`

`fewer-bottles ( u -- u-1 ) `{--}$this-many-bottles`

99& drink!
oh-no!
99& please!



Cheers,
Mark Humphries