Who make a coyote call that works.

Tally Ho by Tal Lockwood. It is a simple open reed call that has worked for me for years.

there are tons of good calls out there, but if you want some unique ones to consider. check out
http://www.predatormastersforums.com/ubbthreads/ubbthreads.php

It is a forum much like this one for predator hunters.  Scrool down to custom calls.  You will find many fine handmade custom distress calls and howlers that are very reasonably priced.
Beleive me, I make some and I would never sell them for what some of these guys are offering them for.  I think most of them just realy like making them and are trying to support thier habit.

DJ Calls from IL makes one.  I own one and it works awesome.  This gentleman used to work at Olts for 30 something years and REALLY nows how to make a call that sound SOO real before it closed down.  He also tried to buy the company but to no avail.

some one needs to make one that sounds like a sliding glass door opening . I have killed out my back door it seems that sound makes them stop and look just long enough to get off a shot.

O2

I got one that called in a mule deer doe, she like to ran over me, squawked again and a 4x3 buck came charging in. Cool. Was carrying rifle at the time but have since called in some more does and smaller bucks. Good bow shots haven't been offered yet but I'm working on it. I try to imitate fawn in distress with call. Guess doing ok. Fawn in distress will bring coyotes in also but when by myself, all I have to do is think about drawing my bow and those dogs are haulin'.

Haydel's Government Hunter Cottontail.  Good and raspy, with a squeeker that you can use while inhaling. Best I've ever used, and I've used a  bunch.  Planning on using it in the morning.

Brian

I think they're like fishing lures:  none of them work all of the time but all of them work some of the time.

Guy

Primos

Gitsem ever time!

most sound good, with the standard production ones you run the risk of the yotes having heard the same sound before.  I like the custom calls due to the fact you can change reeds, and band placement and get a variety of tones out of them.  
Brad H, and Rich Cronk off predatormasters make the best calls to me. Are you looking for open reed, closed reed or howlers?

Here's a few pics of my calls.
 



A red fox i called in last weekend..

If I could afford one, I'd get an electronic FoxPro call, but these are the ones I've had the most success with, with my low-budget air:

Talley Ho

The old style Johhny Stewart #7.  These aren't made anymore and I am always looking for them.  They aren't the PC-7 model they have now, but was pretty close to their PC-3 they have now.

The Verminator Tweety calls

Primos/Randy Anderson Ki-Yi: this one I am really likeing right now A LOT because it is so small and you can make lots of different sounds with it that carry a long way without much air.  It was real windy here yesterday so the deer were not moving.  I saw a yote 500 yards away running a fenceline and called him in with this call in 30 MPH winds to about 40 yards.  No shot at that distance with my longbow in that wind!

Of all these, the easiest to use is the Ki-Yi IMO, the Verminator calls are the loudest and most long range, and the Talley Ho is the simplest and most reliable.

Rufus
Its not unussual at all to call in does, especialy muledeer does, with a predator call.  I have done it many times, in fact I've called in way more deer than predators.  
With a good open read call you can very the pitch of the call by putting preasure on different parts of the read and verying the lenth of time you blow it.  By putting preasure near the tip of the read you will get a high pitch like a cotton tail, preasure a little lower will give you a midrange sound like a jackrabit and preasure way at the bottom will give you a sound like a fawn.
Using it this way you can make a fawn in distress call that will apeal to a does maternal instinct to protect her young and often bring them in fast and mad.  
In fact I called in the doe my son shot 2 years ago that way.
Seems to work way better with muleys than whitetail.

Badlands

Called in a red fox 3 times the other night with a primos cow elk diaphram.  Squeeled on it like a distressed rabbit.  Worked like a champ just wished I could have got him in the right spot for a shot. dino

I'll third the Talley Ho.