VoxForge
$ sudo apt install default-jre icedtea-netx
(default-jre is the Java Run-Time Environment; icedtea-NetX is an implementation of the Java Network Launching Protocol (JNLP) and includes javaws - the command to launch a Java Webstart app)
To do this, you need to update your FireFox preferences to associate the ".jnlp" file suffix with Java Webstart Command
(use: "whereis javaws" from command line to find path)
The association is complete. You can now launch the Voxforge SpeechSubmission app directly from Firefox. Simply click on the WebStart link on the VoxForge read page, and follow the instructions.
You can run a .jnlp file from a web server and run it directly from the command line:
$ javaws http://read.voxforge1.org/speech/SpeechSubmission.jnlp
-or-
download the .jnlp file to your computer first, and then run it locally:
$ javaws SpeechSubmission.jnlp
Download the jar file directly from command line (which is what .jnlp does from the browser...) and run java against the jar:
$ wget http://read.voxforge1.org/speech/speechrecorder_standalone.jar
$ java -jar speechrecorder_standalone.jar