Download it to your home directory and unzip them.
$ unzip Fonts.zip
They are mainly truetype so make a directory called truetype
$ sudo mkdir /usr/share/fonts/truetype
Copy them over
$ sudo cp /home/<user_name>/Fonts/* /usr/share/fonts/truetype
Then add them to the cache
$ fc-cache /usr/share/fonts/truetype
To view the new fonts run a program such as Gimp, Libreoffice, Beaver, Gedit and many others
You can repeat the process if you have fonts from elsewhere.
If you have Java installed you can download and run Opcion (get the .jar file)
$ java -jar Opcion_v1.1.1.jar
And that gives you a list of all the fonts.
To make them available in Java/Eclipse
$ sudo vi /home/<user>/.bashrc
See vi or vim commands
Save and source the file
$ source /home/anton/.bashrc
Now the fonts are available to Java.
Eclipse with new fonts (SteppesTT selected)