Welcome to the forum, Green State!
Here's my personal take on this issue: first of all, there is no such thing as 'free voter IDs.' Even if the voters don't have to pay for these IDs directly, they'll be paying for them in taxes. This is where I'm a bit weary of the constitutionality of some of these laws, because poll taxes are illegal. But in any case, I'm personally in favor of ID laws that are effective but don't disenfranchise the voters or force them to foot the bill (one fair solution could be, perhaps, permitting drivers license to double as voter ID). Nevertheless, I'm not comfortable with the vast amounts of restrictions on voters' rights that the Republicans have been proposing lately. Voter fraud should be addressed in states and communities where it exists, but not a single law-abiding voter should be disenfranchised as a concomitant, especially since fraud is relatively minor in most parts of the country.
Now, to answer your question,
here is a convenient guide to look at that should have about everything regarding these laws. I didn't look deeply into it, as I pretty much just googled 'voter id laws' and that was one of the first results to come up, but I'd suggest checking it out.
