"Knock on Ports" is a port knocking client compatible with knockd, icmpKNOCK and other port knocking servers.

Features:
- UDP/TCP/ICMP sequences
- IPv4 and IPv6 support
- customizable content of UDP and ICMP packets
- ability to start another application after a knock
- Tasker integration
- interpacket delays
- sequence shortcuts
- customizable widget
- data export/import
- free, no ads, open source