JAVA is 'ready for action' on your system (but deb packages won't work for you). Just download the Java Archives (JAR) and start from there.
java -jar SMonitor.jar -v
java -jar ttimer.jar -v
Installation via command line
sudo dpkg -i [/home/"NAME"/Downloads/]ttimer-2.0.deb
sudo dpkg -i [/home/"NAME"/Downloads/]smonitor-2.0.deb
There are some graphical tools to install Debian packages (.deb) too, e.g. "qapt", "gdebi", ...
To remove the packages afterwards is also very easy
sudo dpkg -r [/home/"NAME"/Downloads/]ttimer-2.0.deb
sudo dpkg -r [/home/"NAME"/Downloads/]smonitor-2.0.deb
Of course, you could leave them on your system as well.
;)