Best for: if you just want to play files online on your computer / tablet / phone etc. However you can't download the files to play offline or to write them to a CD. A useful feature allows you to play a tricky section in an endless loop.
Click here for "Dixit Dominus" on Cyberbass
Best for: somewhere between Cyberbass and John Fletcher - you can play files online or download them. Free to try, but a donation is requested if you find them useful. Uses a synthesised human voice.
Click here for "Dixit Dominus" on Choralia
Best for: if you want to listen to real singers! Online playing is free; you can download for a small fee.
Click here for Handel on ChordPerfect
John Fletcher Music
Best for: downloading files so you can play them offline, load them onto a phone/mp3 player, or write them to a CD. (You can also play them online but it's fiddly to navigate to the files each time.)
Click here for "Dixit Dominus" on John Fletcher Music
(Requires a login. For out of copyright works such as Dixit Dominus it is free to register. For in-copyright works such as the Ryba, a four month individual membership costs £4 for 4 months, or £10 for a year.)