Ixox Flute is a sample player, that emulates a concert flute. Rather good, and probably the best free one, because it features 3 articulations (legato, staccato and percussive).
Ixox Flute Features
SF2 based flute.
3 articulations : normal, staccato, percussive.
Up to 3 velocity layers.
3 octaves, 4 notes per octave (full length no loop).
Dirty vocal noise can be mixed with the flute sound.
Possibility of a second flute that follows the main one.