Yure-tweet is a project mainly written in JavaScript, it's free.
yure-tweet-checker: counts yure tweet and when the number of tweets exceeds the threshold value, reports result to irc. yure-tweet-crawler: collests yure tweet using twitter stream. words are yure or yureta hiragana and kanji. yure-tweet-express: shows latest yure tweets list or specific yure tweets.
Example site: http://yure.khiro.dotcloud.com