There is no official v14 or v15. Many fake "newer versions" are malware. v13 patched is the last stable community release from 2021.
Netcat is a command-line utility. Many GUI wrappers exist, but the classic Netcat (nc) is often already installed on Linux/macOS, or available via Nmap’s ncat for Windows. netcat gui v13 download patched
It is frequently used by the console modding community to send payloads from a PC to a jailbroken console (like a PS4 or PS5) remotely. There is no official v14 or v15
The "Netcat GUI v1.3" specifically refers to a specialized graphical interface often used within the console gaming and jailbreaking communities, particularly for the PS5 Jailbreak Netcat is a command-line utility
NetcatGUI is a simple GUI program that is set to ... - GitHub
: These tools provide a visual interface for network debugging and investigation, making complex commands accessible through buttons and text fields Patched vs. Original