HomeAppsToolsKnock on PortsApps like Knock on Ports Here are some great alternatives to Knock on Ports by Alexander Yaburov : PortKnocker ★3.7 UDP Guard ★4.3 TCP Ports list ★4.6 UDP TCP Server ★4.0 NoobzVpn ★4.7 Ping: test high latency, delay ★4.1 Port Authority - Port Scanner ★4.1 UDP Terminal ★3.9 ALFAISAL Inject ★3.9 TCP UDP Server & Client ★4.5 Knock Down Game - Bottle Hit ★3.3 Knock In VIP Messenger ★3.6 Packet Injection ★3.8 Fast Port Scanner ★3.5 UDP/TCP Widget ★4.9 STU for NAT ★3.5