fonglh

Easily create an announcements news ticker on your website. Put up new announcements just like how you would put up a blog post. Use the [announcements] shortcode to display all your announcements in a page or post.
Customize the look of your ticker from the WordPress administration screens. An options page allows you to change the colours and size.

Announcements Ticker

Provides a shortcode and custom post type to display announcements using a jQuery news ticker.

Rupok

Eity

An announcement plugin that shows your announcements/breaking news/offers/notice on top of the website. 
Stylish show of announcements will attract the eye of your visitors. Fully controlled by date. Best suitable for promotional offers, Notices etc.
Here you can get more information about this plugin – http://www.rupok.me/projects

Responsive News & Announcements

An announcement plugin that shows your announcements/breaking news/offers/notice on top of the website.

Announcements Ticker vs Responsive News & Announcements