I have compiled lists for fund accounting systems (see the surveys on the resepective topic, here from Barrington), transfer agency (see also the Barrington survey), compliance and order / portfolio management systems and added them as link lists on this blog (displayed on the right side). They will constantly be updated.
You may find other overviews on WallStreetAndTech (in English) and BankersPlus (in German, you might have to register first). Also interesting is the survey from Investment Advisor Association or the general surveys from Celent, or on specific issues on requirements for those systems at SourceMedia.
GCEY and KPMG also do surveys, but the the last publicly available survey on fund accounting systems I found is from 2004.