On linux, via terminal :
cd ./path/to/myfolder
mkdir colorOracle
curl -o ./colorOracle/ColorOracleJar.zip -C - http://colororacle.org/ColorOracleJar.zip
unzip -n ./colororacle/ColorOracleJar.zip -d ./colorOracle
chmod a+x ./colorOracle/ColorOracle.jar
./colorOracle/ColorOracle.jar
For other OS, see http://colororacle.org