My Bluetooth stack sources from 2005/2006 (?) are currently in the MorphOS repository. They include a basic HCI layer, ACL layer, L2CAP layer, Service Discovery Profile, incomplete RFCOMM, AVDTP layer and an incomplete A2DP implementation (but I had my A2DP headphones streaming MP3s from the Amiga at that time).

If somebody wants to pick up the project, he's welcome. Notice that once the product is finished, official qualification testing must be done with the BT Sig -- otherwise the release is illegal. This requires BT Sig membership for 3500 to 7000 USD per year.