Here is a list of all documented files with brief descriptions:

_cxxwrap.h
api-legacy.h
api3.h
apiattr.h
assert.h
cntl-private.h
cntl.h	Command codes for libcouchbase
couchbase.h	Main header file for Couchbase
deprecated.h	Deprecated APIs
environment.h
error.h	Definition of all of the error codes used by libcouchbase
http.h
intro.h
iops.h	Public I/O integration interface
ixmgmt.h
kvbuf.h	Low level structures used by commands for buffers
libev_io_opts.h	Libev integration with libcouchbase
libevent_io_opts.h	Libevent integration with libcouchbase
libuv_io_opts.h	Libuv integration with libcouchbase
mainpage.h
n1ql.h
pktfwd.h
subdoc.h
sysdefs.h
vbucket.h	VBucket Mapping API
views.h
visibility.h
wsaerr.h