The young soprillo, a tiny saxophone pitched in Bb an octave above the soprano, has only one manufacturer
eppelsheim.com
but quite a few musicians play it already. Hear it there
v0tFp2_H3R8 at 05:20-5:42
soprillo.com in tabs Media, Soprillogy, Planet Soprillo
or just search elsewhere for "soprillo".

Many people know only saxophones that blare fortissimo all the time to be heard because so does the drummer behind them, so here's a classical saxophone quartet with a nice sound:
music.mcgill.ca

Soprillo.com doesn't give hearing samples any more, but here is an other soprillo player:
nOWI4rR9Bxw - 1dIAON5Je3M

The easy range of a saxophone covers only two octaves and a sixth, written from Bb to F# around the treble clef staff, plus minus  a semitone. Beyond F# start the altissimo register, not demanded from amateurs and written with caution for professionals, with complicated fingerings, and which generally sounds a bit more... I mean, perhaps not so much... well, plain horrible. But here's a saxophonist with nice altissimo, both on the alto and soprano
rOTbgUeIH64 - xpG-H32sXDw
He even plays glissando at 2:18. Don't expect that from every advanced professional.

Low saxophones get easily a rough sound when playing a bit loud, but here's a baritone saxophone with soft sound:
WaUKo3MKx4o
And here an agile one:
RVOBQBamjDA
And here's a bass saxophone with soft sound:
7yFl5IG7LSQ (at 0:22) - y1-ObFx60IA