Sibelius Music provides a web page for users of their software (and Finale) to publish their works. Some of it is very good. Some of it is

There are over 800 quartets/quintets on Sibelius Music. In a period of the last six months I have listened to all of them (not always all the way through) and boiled them down to the ones I think are the cream of the crop.

If you are looking for inexpensive (and often free) brass quintet music, check out
http://www.ibowtie.com/storesibeliusbrassq.html

You can hear everything before you download or buy (requires a small plug in -- info on the web page). I get nothing for this, BTW, just a hobby and a service.

Jim