Topera is a brand new TCP port scanner under IPv6, with the particularity that these scans are not detected by Snort.
You can download it from the following link: https://packetstormsecurity.com/files/download/119016/topera-v0.0.2.zip
Source: https://packetstormsecurity.com/files/119016/Topera-IPv6-Port-Scanner-0.0.2.html