Apps like Knock on Ports

Here are some great alternatives to Knock on Ports by Alexander Yaburov :
TCP Ports list
TCP Ports list
★4.6
Ping: test high latency, delay
Ping: test high latency, delay
★4.2
UDP Terminal
UDP Terminal
★3.9
Port Authority - Port Scanner
Port Authority - Port Scanner
★4.1
TCP UDP Server & Client
TCP UDP Server & Client
★4.5
Ha Tunnel Pro
Ha Tunnel Pro
★3.9
ALFAISAL Inject
ALFAISAL Inject
★3.9
Packet Injection
Packet Injection
★3.8
Knock In VIP Messenger
Knock In VIP Messenger
★3.6
RY TUNNEL VPN - Super Fast Net
RY TUNNEL VPN - Super Fast Net
★4.7
UDP/TCP Widget
UDP/TCP Widget
★4.9
Fast Port Scanner
Fast Port Scanner
★3.5
STU for NAT
STU for NAT
★3.5
Advanced PortChecker
Advanced PortChecker
★4.3
NetPal - netcat for Android
NetPal - netcat for Android
★4.3
TCP Client
TCP Client
★4.4