NetCheck for GNU Linux/Windows/Mac
(c) V. Subhash, 2017.
http://www.vsubhash.com
Released as public-domain source code
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This Java desktop application displays popups from the notification panel (system tray) whenever the Internet connection drops. It detects the connection status by pinging a high-traffic high-availability website at regular intervals.

To run the app, ensure that you have Java runtime (JRE) and run the command.
  java -jar NetCheck.jar

Execute the following command to download the source code.
  git clone https://github.com/vsubhash/netcheck-j2se.git