Is there a good flag icon pack that corresponds to ISO-3166 Country Codes?

I'm in need of an icon pack containing flags that correspond with ISO-3166 country codes such as US, CA, SE, DE etc. Optimally the flag icons would have names such as us.png, ca.png and so on. I'm guessing this is a common developer necessity making this a great place to ask.

Is this what you are looking for http://www.famfamfam.com/lab/icons/flags/

Also have a look at:

• http://icondrawer.com/free.php
• https://www.gosquared.com/resources/flag-icons
• http://www.content-pack.com/free-flags-icons/
• https://github.com/stevenrskelton/flag-icon
• http://mdb-blog.blogspot.com/2016/10/list-of-country-flags-png-by-iso3.html
• https://dribbble.com/shots/1089488-Stripe-Flag-Set