Nicolas Bernier

Inserts Twitch.tv stream status tags in your blog. The tags just indicates if the stream is live with a blinking red cirle or offline.
Supports multiple channels.
Also implements a simple widget showing the stream status (including the thumbnail, title, game name and number of viewers) + CSS classes to show and hide some elements of the markup accordingly to the channel status.
The tags and the widget are updated every 30 seconds.

Twitch Status

Inserts Twitch.tv stream player and chatbox in your posts, stream widget and online status tags in your menus. Supports multiple channels.

Jerry

With this plugin you can display specified streams that are live on Twitch.tv
Plugin uses cron to fetch data from Twitch API (interval of 5min).
You can display streams using widget or a shortcode. 
Examples: [livetwitch count=2] [livetwitch singular=”rainbow6″]

LiveTwitch

With this plugin you can display specified streams that are live on Twitch.tv

Twitch Status vs LiveTwitch