https://www.hrblock.com/online-tax-filing/free-online-tax-fi...
Their gimmick is to use popups to try to get you to buy two things:
1. Convenience of importing your W-2 data vs manually typing it all in. It kept popping that up trying to get me to buy that. Then, after saying I'll manually enter everything, it tells me there's some way to automatically get a W-2 from registered employers where it has all the information already. It did that. So, I didn't pay a convenience charge but got same thing looks like. Sneaky.
2. Keeping all the stuff on file with unlimited access. They only keep the tax documents for a limited time with the free option. Site reminds you that you will have to pay some high fee to the IRS to get them outside that window. I just printed a copy (shrugs).
Overall, the free filing was extremely easy to use with the get help links being really helpful. Got more back than I did with a tax professional last year. Partly due to not paying a tax professional. :)