The rest of the list and HTML/CSS powered login forms but here you can see the best login form, Signup Form, Registration Form. You will find out here different pattern, different design, Choose according to your requirement. Free Download Login and Registration Form with HTML, Bootstrap, CSS.
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Simple Registration Form
Check this Simple Registration Form in Bootstrap Php Mysql, you can use this according to your need. If you have an website, you want simply register your users with simple details. This form has minimal options like for name, birthdate, gender and other fields which you can customize entirely.