NetSTR is an open source small, fast and easy to use port scanner and packet sniffer. IPv4 scanner can perform ranged, single or use an internal top ports list plus it has a flexible timers/port capability. IPv6 single port single host is supported. The tcp and arp sniffers print an easy to read dump format and have a full packet decode capability. Additionally netstr sports a fuzzy passive network scanner.
You can download it from the following link: https://packetstormsecurity.com/files/download/141428/netstr-0.20.tar.gz
Source: https://packetstormsecurity.com/files/141428/NetSTR-0.20.html