Rohil

Contact Form 7 : Hide Success Message will allow you to simply hide the message with Effect after some delay time.
Now you can also hide validation and failed message with premium plugin (Only $2)
Features
<ul>
<li>You can choose effect.</li>
<li>You can speed time of the effect.</li>
<li>You can decide delay time(after that time message will disappear)</li>
<li>You don’t need to deactivate the plugin. You can disable plugin from the Setting page.</li>
</ul>
Many user want to hide success message that is been generated after email has been sent successfully but somehow they are not able to find it on google.So this plugin will allow them to hide it wihout any coding or additional settings.
We always welcome your <a href="https://wordpress.org/support/plugin/contact-form-7-hide-success-message" rel="ugc">suggestion</a> and We are always there to support you.
<a href="https://wordpress.org/support/plugin/contact-form-7-hide-success-message" rel="ugc">Support Page</a>
Even Contribution is also welcome. Contact me through rohilmistry [dot] ymail [dot] com.
NOTE: You need to enable the plugin from its setting tab and then only message will be hide otherwise it will remail there.It will only hide the SUCCESS MESSAGE. 
INITIAL RELEASE

Contact Form – 7 : Hide Success Message

An add-on for Contact Form 7 that will let you to hide only Success Message after defined time.

essitco

Captcha Solution is a powerful WordPress Captcha Plug-in that protects your WordPress website from Bots. It allows you to add an extra layer of security on top of you in built protection. This will keep spammers and bots away from submission redundant data in your web forms.
Captcha Solution is an easy yet powerful plug-in that provides easy-to-solve Captcha tests while still being tough on the bots. It protects your wordpress sites from spam entries by means of text images.
<h4>Captcha Solution Features:</h4>
• Installation and integration is easy 
• It is fast, secure and reliable 
• Multiple Captcha on one-page support. 
• Option to refresh Captcha 
• Limit maximum login attempts

CAPTCHA Solution

CAPTCHA Solution is a CAPTCHA module intended to be called from other plugins. It is originally created for my Contact Form 7 plugin.

Contact Form – 7 : Hide Success Message vs CAPTCHA Solution