SaltwaterC

XVE (XVE Various Embed) is a simple yet powerful way to add media content to your WordPress blog. It is a drop-in replacement for my old XHTML Video Embed plug-in, while it aims to continue the original support.
The plug-in is self documented, so there’s the point where you may want to start. The help is integrated into the WordPress help system. If you’re looking for it, it’s into the above menu, the ‘Help’ item. For some of you, this isn’t so obvious as the Help system is kinda new.
New features and support requests are honored better if you open a <a href="https://github.com/SaltwaterC/XVE-Various-Embed" title="GitHub" rel="nofollow ugc">ticket on GitHub</a> where this plug-in is actually hosted.
Supported video services: youtube.com (youtu.be URLs as well), metacafe.com, dailymotion.com, revver.com, spike.com, vimeo.com, livestream.com, capped.tv, trilulilu.ro, 220.ro, collegehumor.com, myvideo.de, snotr.com, gametrailers.com, blip.tv
Supported audio services: trilulilu.ro, 220.ro
Supported image services: trilulilu.ro
It also supports generic SWF / FLV (MP4) embedding.
For the FLV (MP4) embedding, there are three provided players: Flowplayer, FLV Player, and JW Player. You may change them on the fly without the need to change the embed code.

XVE Various Embed

XVE (XVE Various Embed) is a simple yet powerful way to add media content to your WordPress blog.

Roland Rust

It functions as a frontend for the Markup Validator Web Service API on http://validator.w3.org. Stylesheets are checked as well.
Languages available: 
+ english 
+ deutsch(german)

Batch Validator

This plugin performs a batch markup validation check over your entire WordPress website.

XVE Various Embed vs Batch Validator