VoxForge
$ sudo apt install default-jdk
no longer works.
You can us javaws to download the .jnlp file and run it locally 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:
$ wget http://read.voxforge1.org/speech/SpeechSubmission.jnlp
$ 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