http://www.magentocommerce.com/magen...ttributes.html
Nice extension list you have shared here. All these extensions are very useful for online store owners. Here's I shared my some extensions. Have a look at our magento extension
Thanks for sharing. In case you need a Magento 2 extension to add extra field to checkout page. Here is an awesome option for you:
Checkout Custom Field Extension for Magento 2 is the excellent tool to gather additional data from customers during checkout by including extra field in the Shipping and Billing information.
1. Add any custom fields to the checkout page in any step
Attachment 11192
2. Create new custom fields of different types: radio button, checkbox, date & time, yes/no, text field, and text area.
3. Include additional field values in Order Grid and Order Detail
4. Display custom field information in email and PDF document
Attachment 11196
5. Easily view and edit custom fields in Manage Checkout Custom Fields Grid
6. Show checkout custom field per store view
Free Installation | Free 1-Year Support | Free Lifetime Update