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

ghostinajar

Signups allows you to easily create and manage signups for your school, organization or event.
For more features, check out Signups Pro here: 
<a href="http://www.ghostinajar.me/software/signups-pro/" rel="nofollow ugc">http://www.ghostinajar.me/software/signups-pro/</a>
Use it for:
<ul>
<li>School Sign Ups</li>
<li>Volunteer Sign Ups</li>
<li>Church & Temple</li>
<li>Fundraising</li>
<li>Scouting Events</li>
<li>Family Events</li>
<li>Sports Events</li>
<li>Potluck Invites</li>
<li>College Activities</li>
<li>And many more!</li>
</ul>

Signups

Signups allows you to easily create and manage signups for your school, organization or event. Unlimited number of Clipboards and unlimited number of …

Traum Captcha vs Signups