Yes Credit Karma is a good option and website for filing taxes.
You just need to signup for Credit Karma which is free and besides being able to file your Taxes through Credit Karma you also can get your free credit report and credit scores with the free Credit Karma account.
Filing your Taxes with Credit Karma is totally free and worth it and I now use Credit Karma to file my taxes all the time and it's pretty easy to file taxes using Credit Karma.