Of the thousands of open APIs available, one of the all-time most popular is the YouTube API. We now list 440 YouTube mashups in our directory. Naturally, some are better than others. Below are our Top 10, as determined by popularity and editorial review. Do you know of other good YouTube apps that we’ve missed? Just let us know in the comments.
- TubeSpy: TubeSpy is an application that shows the videos being watched on YouTube as they are being watched. APIs: YouTube. More at our TubeSpy profile.

- Beardscratchers Compendium: A music-based mashup that connects and filters disparate music metadata from across the Web, with an aim towards accuracy and focus on the music. Combines many different APIs from YouTube to Last.fm. APIs: Amazon eCommerce, Echo Nest, Eventful, Flickr, Gruvr, Last.fm, MTV, MusicBrainz, Songkick, Upcoming.org, Wikipedia, Yahoo Music, Yahoo Search, YouTube. More at our Beardscratchers Compendium profile.

- popurls.com: For years now, this has been one of the most successful news dashboards on the web. It combines over 15 concensus filters into a one-page view. Good looking, Ajax interface. Includes Digg, Flickr, BoingBoing, NewsVine, del.icio.us, Reddit and others. APIs: del.icio.us, Flickr, YouTube. More at our popurls.com profile.

- Viral Video Chart: See the most talked about videos…currently tracking YouTube, MySpace and Google Video. APIs: YouTube. More at our Viral Video Chart profile.

- Geo Best-of YouTube: Web mapping based application to watch most viewed videos on YouTube filtered by countries and time. APIs: Google Maps, YouTube. More at our Geo Best-of YouTube profile.

- Tagbulb: Tagbulb simplifies tag search by aggregating content from various sources like Flickr , YouTube and many more. Users can browse by content type like images, videos, blogs, bookmarks, podcasts, products, books etc. APIs: 12seconds.tv, 23, 43Things, 5min, Amazon EC2, Amazon eCommerce, AOL Video, arXiv, BBC, BibSonomy, Bing, Blinkx, Blip.fm, Blip.tv, Blogmarks, Buzznet, Cafe Press, del.icio.us, Digg, Digital Podcast, eBay, Eventful, Flickr, Floobs, FriendFeed, Google Ajax Search, Google Book Search Data, Google Friend Connect, Google Picasa, Google Search, Grouper Video, Howcast, indeed, Internet Video Archive, ISBN db, Kewego Video, Last.fm, LazyTune, LiveVideo, Ma.gnolia, Photobucket, Raw Sugar, Revver, Riya, ShareThis, Simply Hired Jobs, Smugmug, Spraci, Technorati, Twitter, Upcoming.org, Viddler , VideoSurf, Vodpod, WebShots, Wikipedia, Yahoo Answers, Yahoo Image Search, Yahoo Local Search, Yahoo Mail, Yahoo Related Suggestions, Yahoo Search, Yahoo Video Search, YouTube, Zooomr. More at our Tagbulb profile.

- TimeTube: Shows YouTube videos on an interactive timeline based on keywords you enter, e.g. Barack Obama or Chocolate Rain. APIs: Dipity, YouTube. More at our TimeTube profile.

- YouFlow: A mashup combining the JavaScript effects ImageFlow and Highslide JS with the YouTube API. With YouFlow you can search all the YouTube videos, browse them with ImageFlow and open them with Highslide. APIs: YouTube. More at our YouFlow profile.

- YouTube Made Simple and Visual: View YouTube in an un-cluttered more visual way, your search terms will display 50 video images, a description is shown by hovering over each image. Google searches are shown for News, Web, Images, Books and Blogs related to search terms. APIs: Google Search, YouTube. More at our YouTube Made Simple and Visual profile.

- Your Own Music Television: This mashup takes your top 50 artists and plays random music videos by those artists. It can go full screen and you can play your lastFM friends favorite artists too. APIs: Last.fm, YouTube. More at our Your Own Music Television profile.

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Adam DuVander
Executive Editor, ProgrammableWeb. Author, Map Scripting 101. Lover, APIs.
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