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

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.