Shea Bunge

<blockquote>
Important: Since version 2.0, this plugin now requires at least PHP 5.3. Please ensure you are running the latest available version of PHP on your server.
</blockquote>
This plugin adds <a href="https://www.google.com/recaptcha/" rel="nofollow ugc">Google’s reCAPTCHA</a> to the BuddyPress registration page and WordPress login page to prevent bots from registering and keep your site free from spam registrations.
reCAPTCHA is “tough on bots, easy on humans”: while it is increbianle effective on preventing bots from registering, most of the time all the user needs to do to verify themselves is simply check a box.
After installing this plugin, you will need to <a href="https://www.google.com/recaptcha/admin" rel="nofollow ugc">register your site with Google</a> (requires a Google account) and enter the site key and secret key on the Settings > BuddyPress > Options admin menu. If you would prefer not to use Google’s service, there is an alternative security check method also available; see below;
Prior to version 2.0, a less effective security check method was used where the user needed to answer simple math sum before registering. This method is still available, and can be turned on on the Settings > BuddyPress > Options menu.
You can learn more at the <a href="https://bungeshea.com/plugins/bp-security-check/" rel="nofollow ugc">plugin’s website</a>, or on <a href="https://github.com/sheabunge/bp-security-check" rel="nofollow ugc">GitHub</a>
Translations
Thanks to the awesome work of the following translators, this plugin can be used in these languages:
<ul>
<li>Indonesian thanks to <a href="https://www.chameleonjohn.com/" rel="nofollow ugc">Jordan Silaen from ChameleonJohn.com</a></li>
<li>Russian thanks to <a href="http://superbwebsitebuilders.com/" rel="nofollow ugc">Howard Steele from SuperbWebsiteBuilders.com</a></li>
<li>Swedish thanks to <a href="http://tdh.me" rel="nofollow ugc">Thord D. Hedengren</a></li>
<li>French thanks to Frédérick Baldo</li>
<li>Serbo-Croatian thanks to <a href="https://webhostinggeeks.com" rel="nofollow ugc">Andrijana Nikolic from WebHostingGeeks</a> and <a href="http://firstsiteguide.com/" rel="nofollow ugc">Ogi Djuraskovic from FirstSiteGuide.com</a></li>
<li>Spanish thanks to Renato Alves</li>
<li>Hungarian thanks to Laszlo Espadas</li>
<li>Brazilian Portuguese thanks to Renato Alves</li>
<li>Danish thanks to Andreas Bjørn Hassing Nielsen</li>
<li>Italian thanks to <a href="http://nicolecurioni.com/" rel="nofollow ugc">Nicole Curioni</a></li>
<li>Belarusian thanks to <a href="https://www.ustarcash.com" rel="nofollow ugc">Natasha from uStarCash</a></li>
</ul>
If you have a translation to contribute, please sent it through to me <a href="https://bungeshea.com/contact/" rel="nofollow ugc">by email</a> or <a href="https://github.com/sheabunge/bp-security-check/pulls" rel="nofollow ugc">on GitHub</a>.

BuddyPress Security Check

Combat spam registrations for a BuddyPress-powered site using Google's reCAPTCHA

Mikoviny

This is just Beta version of this Plugin with some Bugs, but I need to report them (<a href="http://wpmath.g6.cz/" rel="nofollow ugc">http://wpmath.g6.cz/</a>).
I had to rewrite the core function of plugin. In these case UNITS are NOT working. In few days I fix these bugs.
News:
<ol>
<li>Couting with matrices (solving linear equation) </li>
<li>Creating Graphs</li>
<li>Math and Trigonometric functions like a^x, floor, round, sin, cos…</li>
</ol>
What this plugin can do:
<ol>
<li>Display mathematical documents. Plugin is using PhpMathPublisher</li>
<li>Add, Subtract, Multiply, Divide.</li>
<li>Count with matrix</li>
<li>Display Graphs</li>
<li>Show results.</li>
<li>If you add “==” on the end of formula at first it inserted variables and than show result.</li>
<li>Converting e-mail in posts and pages to *.png picture.</li>
<li>Add form with custom variables for page visitors.</li>
<li>Multiple inputs.</li>
<li>Static counting</li>
<li>Use multiple functions (Ceil, ceil, Floor, floor, Round, round, acos, acosh, asin, asinh, atan… <a href="http://www.wpmath.g6.cz/functions/" rel="nofollow ugc">Full list</a>).</li>
<li>Basic units NOT WORKING IN 0.4.0. !!!!</li>
</ol>
<h4>How it works</h4>
<ul>
<li><a href="http://wpmath.g6.cz/" rel="nofollow ugc">Visit the plugin site</a> </li>
</ul>
What I want to do:
<ol>
<li>Add real units</li>
<li>Add some other math functions</li>
<li>Add some TinyMC buttons</li>
<li>Make it easy to plug-in with your own functions</li>
</ol>
<h4>Contact:</h4>
<ul>
<li>site: http://wpmath.g6.cz</li>
</ul>

WP Math

This is just Beta version of this Plugin with some Bugs, but I need to report them (http://wpmath.g6.cz/).

BuddyPress Security Check vs WP Math