This could be of interest to composers who use virtual instruments:
www.composerscompetition.eu
They have a separate category for compositions rendered with virtual instruments, so these pieces don't have to compete with pieces for which the composers had the opportunity to actually record them (which is, imo, a good idea).
IMPORTANT: The rules say that the performance must be an audio export from a notation software, but I asked if they meant this literally and they don't - as long as it is not recorded with live musicians, they don't care if it's done with a notation software, a DAW or any other method that involves virtual instruments.