fusefs bindings
C: native
C++: fusexx
http://portal.itauth.com/2007/07/07/c-fuse-binding
Ruby: fusefs
http://rubyforge.org/projects/fusefs/
but it looks like does not have activity now.
Python: Python interface for FUSE
http://fuse.sourceforge.net/wiki/index.php/FusePython
devel/py-fusefs in FreeBSD ports.
Haskell: hfuse
http://darcs.haskell.org/hfuse/
sh: Fuse-J-shfs
http://hwi.ath.cx/twiki/bin/view/Neuralyte/FuseJshfs
SWIG bindings: FuseWrapper
http://arg0.net/wiki/fusewrapper
I think the Python-binding is a good solution for me since FreeBSD ports has.