PLOTMTV is a public domain package, producing high quality colour graphics. It is available on the OASES web site:
<ftp://keel.mit.edu/pub/Plotmtv/>
Download the two files:
Plotmtv1.4.1.tar.gz mtvpatch.tar.gz
Place these two files in a temporary directory, e.g. /tmp. Then execute the commands:
gunzip -c Plotmtv1.4.1.tar.gz | tar xvf - gunzip -c mtvpatch.tar.gz | tar xvf -
Then follow the instructions in the README file. Once you have executed the make command, remember to move the executable plotmtv to a directory in your path, e.g. /usr/local/bin.