Brian Zeligson

After installing and activating, there will be a Category Sticky meta box on the Edit Post page. Add categories where you want the post you’re editing to be sticky and update the post, and you’re done.
When displayed as sticky posts in a category listing, posts will have a ‘category_sticky_post’ class added to them for additional styling.
Note that this plugin uses the “the_posts” filter. This means you can set a post sticky for a category that it doesn’t belong to, and it will show on that category when the archive is viewed.
Sidebar widgets will also reflect the sticky order when an archive is being viewed.
For help or other plugins, find me at http://www.workinginboxershorts.com

WP Category Sticky Posts

Allows you to set Sticky posts for individual category archives.

LIJE

Developed by <a href="http://www.lije-creative.com" rel="nofollow ugc">www.lije-creative.com</a>, this module will automatically stick a defined number of posts (default blog post) to the homepage. It will update itself if you add, remove, edit a post or change your permalink structure or update your categories. 
It is particularly useful since the new Twenty Fourteen WordPress theme promote the ‘sticked blog posts’.

Auto Sticky Post

Easy Sticky Post is a plugin that stick your last 'n' blog posts to the homepage.

WP Category Sticky Posts vs Auto Sticky Post