jysafe

CN: 最基本的形式： 
 输入上图物质分子式，看着复杂，其实挺简单的，数数各个原子个数，按照顺序堆起来就行了。 
 此外还有计算矩阵、说出事件发生日期的验证码，三者随机出现。
EN: This is a special captcha plugin. 
 It is not verified by math but by chemical formula and Calculation matrix and date of some event.

Traum Captcha

cierczek91

Allow all world users to sign in/up fast and secure in your web via their Persondoc accounts
Features provided with this plugin:
<ul>
<li>Completely integrate with WooCommerce plugin</li>
<li>Work on myaccount page only</li>
</ul>

PersonDoc for WooCommerce

An extension of WooCommerce that integrate fastcheck PersonDoc in your Woocomerce login page.

Traum Captcha vs PersonDoc for WooCommerce