Bergamini

Video Converter
Adds a link under the video embedded that allows to download or convert video to mp3. It supports Youtube and Vimeo at the moment but other portals like, DailyMotion, Facebook, Instagram will be added soon.
Supported WordPress youtube plugins
Currently these are a number of Youtube WordPress plugins that we support:
<ul>
<li>Default WordPress behavior without any wordpress plugin (mediaelements.js is not supported yet)</li>
<li>Smart YouTube PRO</li>
<li>Viper’s Video Quicktags</li>
<li>YouTube Embed</li>
</ul>
Supported Sources:
3sat, 8tracks, Archive.org, ARD, Arte.tv, AUEngine, Bandcamp, blip.tv, Break, Brightcove, CollegeHumor, ComedyCentral, CSpan, Dailymotion, DepositFiles, Dotsub, Escapist, Facebook, Flickr, FunnyOrDie, GameSpot, Gametrailers, Generic, HotNewHipHop, Howcast, Hypem, Ina, InfoQ, Instagram, Jukebox, Justin.tv, Keek, Liveleak, Metacafe, Mixcloud, MTV, MySpass, Myvideo, NBA, Photobucket, Plus-Google, RBMA Radio, RBMARadio, Soundcloud, Spiegel, Stanford OC, Statigram, Steam, Teamcoco, TED, TF1, TrailerAddict, Tudou, Tumblr, Tutv, ustream, Veoh, Vevo, Google Video, Vimeo, Vine, Wat.tv, Wimp, WorldStarHipHop, Yahoo, Youtube, Youku, ZDF
If you are using a youtube plugin that’s not supported please contact us and we will build support for it.
If you have any problems or suggestion please don’t hesitate and contact us on info@speeddownloader.com
Options include:
<ul>
<li>Customize appearance of link with custom css class</li>
<li>Customize the link text</li>
<li>Set the position of the link</li>
<li>Set the plugin to run on only on certain blog-post categories</li>
</ul>

Video Converter

Simple but it works

This Plugin Adds a link under embedded video's that allows to download or convert the video to mp3.

wpsolutions

The SoundCloud Ultimate plugin allows musicians, podcasters or web owners who use SoundCloud to manage or display their tracks from their WordPress site. 
The plugin’s features are listed below:
<ul>
<li>
Secure authentication/connection from your WordPress site to your SoundCloud account using oAuth2
</li>
<li>
Display any of your tracks with the special SoundCloud player anywhere on your blog by using a special shortcode
</li>
<li>
Upload new tracks from your WordPress administration panel directly to your SoundCloud account.
</li>
<li>
View your current tracks from the WordPress admin panel which you have already been uploaded to your SoundCloud account.
</li>
<li>
Play/preview currently uploaded tracks directly from the WP admin panel
</li>
<li>
Delete tracks from your SoundCloud account directly from the WordPress admin panel
</li>
</ul>
For more information on this and other plugins, visit the <a href="http://wpsolutions-hq.com/" rel="nofollow ugc">WPSolutions-HQ Blog</a>. 
Post any questions or feedback regarding this plugin at our website here: <a href="http://wpsolutions-hq.com/soundcloud-wordpress/" rel="nofollow ugc">SoundCloud Ultimate</a>.

SoundCloud Ultimate Plugin

Allows you to upload, display, preview, or delete tracks to/from your SoundCloud account.

Video Converter vs SoundCloud Ultimate Plugin