Nikolay Bachiyski

In WordPress you can set individual templates for pages, which allows you to easily include additional functionality. Unfortunately this feature is not available for posts. Here is where this plugin comes.
After installtion you will be able to choose a template for each post the same way you do with pages.
You can find <a href="https://codex.wordpress.org/Pages#Creating_Your_Own_Page_Templates" rel="nofollow ugc">how to your own templates</a> in the Codex.

Templates for Posts

The same as page templates, but for posts.

iDo8p

NOTE : This plugin is translation ready 
NOTE : You need php 5.2+
Add the ability to create post template. 
You can manage templates and use them to prefill a post. 
Also prefill the post title.
Work with wordpress and wordpress mu. 
Works with qtranslate.
Inspirated from “Article Templates”

Templates for Posts vs WPMU Prefill Post