Don’t know if this will be anygood to anyone but all you do is add your URL to your website into the box or even manually add your website keywords and it comes up with a list of 100 possible keywords for your website.
All you do then is pick the ones with the highest search results and then just click on the add link to generate a list of great keywords for your website. Once you have done that pick the top 10 at most and then copy paste them into your meta keywords section in the
The great thing is google is number 1 and this is all free. You can also download a text file ot even a csv file. Hope it helps.
Heres the link
https://adwords.google.com/select/KeywordToolExternal
Enjoy.