Dscan is a distributed port scanner which scans from many hosts, making it harder to detect. Uses a client / server model.
You can download it from the following link: https://packetstormsecurity.com/files/download/24860/dscan-0.1.1src.tar.gz
Source: https://packetstormsecurity.com/files/24860/dscan-0.1.1src.tar.gz.html