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

wptobe

The easiest, fastest and most reliable membership plugin
The wptobe-signinup plugin provides functions for member registration, login and member management required on the website, 
It focus on ease of use and fast speed and stability. It offers a Captcha function to protect against spam by default and easily change the design of any theme by selecting a pre-made template without any programming.
Member Registration, Login, Reset Password, Profile, Change Password. 
우커머스 쇼핑몰 체크아웃 국내 주소(Daum 우편번호 서비스) 사용 기능.
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The capcha can be used for sign-in/sign-up screen to prevent spam users.
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Each field can be edited and the position can be easily changed by drag-and-drop. The setting screen and the short code output are the same, so it is very intuitive and easy.
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It provides on/off switch to show or hide each field.
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It is possible to log in by email without username.
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You can set the page to be redirected after sign-in/sign-up.
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No need to put the short code directly in a page, just select it from the selection box.
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You can create different styles and change them whenever you want. For example, create a themeA, themeB C style whenever the theme changes, simply change it in the selection box to change the design. We provides Default/Black/Avada/Enfold design by default.
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It allows users to receive via email if they forget their password. The administrator can modify the content of the email to be sent.
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Members can change their current password to a new password on the profile page.
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It provides an html/css file that outputs sign-in/sign-up/profile independently, so you can easily change and copy it.
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You can reset the plug-in to the initial state at any time.
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<h4>User Guide</h4>
You can find user guide, installation and more detailed information about Wptobe-signinup on wptobe.com. 
* <a href="http://www.wptobe.com/wptobe-signinup" rel="nofollow ugc">User Guide</a>

Wptobe-signinup

Wptobe Signinup is a very light plugin that lets you easily and safely build sign in/up with designed page.

Traum Captcha vs Wptobe-signinup