Slava Abakumov

After activating all current and possible future widgets will get extra BuddyPress specific options. 
You will be able to select on which users profiles or groups pages you want to display this widget and on which – don’t.
So you will get more flexibility in arranging your sidebars (or widget-zones).

BuddyPress Extend Widgets

Provide all widgets with BuddyPress specific fields (conditional display logic)

Scott (@scottsweb)

mobble provides mobile related conditional functions for your site. e.g. <a href="https://wordpress.org/extend/plugins/mobble/faq/" title="More examples" rel="ugc">is_iphone(), is_mobile() and is_tablet()</a>.
CSS media queries are great for creating responsive web designs but they do not always provide enough control. There are times when not all of the content, JavaScript or CSS on a page is relevant for a particular device. With the mobble functions you can make these kind of tweaks to your theme.
mobble can also add device information to the body class of your theme allowing you to easily target your CSS for different gadgets.
<a href="http://scott.ee/" title="Freelance WordPress web design Farnham, Surrey" rel="nofollow ugc">a plugin by Scott Evans</a>

mobble

Plugin is very simple and works very well. Great example of the plugin that does one job and does it well. Very appreciated!

Great plugin

Helper plugin that provides conditional functions for detecting a variety of mobile devices & tablets. Perfect accompaniment to CSS Media Queries.

BuddyPress Extend Widgets vs mobble