HAZOTA

This plugin publishes a simple endpoint at <code>/kmut.txt</code> on your site to expose your account identifier for seamless integration with KissMyUpTime’s completely free uptime monitoring service.
A <a href="https://kissmyuptime.com" rel="nofollow ugc">KissMyUpTime</a> account is required, and you can create one for free – no personal data required.
KissMyUpTime offers a real-time interface and instant notifications across all your devices, along with precise uptime percentage calculations, an unlimited number of checks, boostable intervals, and multiple nodes around the world.

KissMyUpTime

Helps you easily integrate KissMyUpTime's completely free uptime monitoring service with your WordPress site.

Waterloo Plugins

Add a body mass index calculator to your blog by using the <code>[bmi]</code> shortcode. See the screenshots for previews.
There are 3 built-in styles: material design, Bootstrap, and default (your theme’s styles).
Options:
<ul>
<li>theme – <code>material</code>, <code>clean</code>, <code>default</code>, or <code>none</code></li>
<li>metric – Label text for metric section</li>
<li>imperial – Label text for imperial section</li>
<li>height – Label text for height input</li>
<li>weight – Label text for weight input</li>
<li>heightPlaceholder – Placeholder text for height input</li>
<li>weightPlaceholder – Placeholder text for weight input</li>
<li>submit – Text for submit button</li>
<li>result – Text for result, use <code>%bmi%</code> to represent the calculated BMI</li>
</ul>
Examples: 
 [bmi theme=”clean”] 
 [bmi theme=”material” heightPlaceholder=”Enter your height” submit=”Calculate your BMI!” result=”Your BMI is %bmi%”]

BMI Calculator Plugin

Great!

Add a simple, stylable BMI calculator to your WordPress blog. Comes with several stylish themes.

KissMyUpTime vs BMI Calculator Plugin