A simple way to block access to the internet per app
Manage port forwardings via UPnP
Graphical network monitoring and documentation tool
Pure Java Network Tools
LSJ-Server-Terra (Java Multipurpose Sever connected with MariaDB)
WebDeets Powerful And Versatile Network Utility App
Pure Java NTP server.
Set of useful android network tools
A modern graphical SSH client
Java SSH API
Jateway is a general purpose TCP/IP connection proxy
Analyze the network carateristics like Delay, Jitter, Packet loss etc.
RDP, VNC and Port-fowarding over a pure HTTP/HTTPS protocol.
A collection of network-oriented tools
The Java NIO based TCP port mapper
Network monitoring tool
NetKitty is a GUI for Netcat