corlax

This plugin help your visitor to publish post and from frontend anywhere on your site. this plugin have so many feature like guest posting, captcha, upload image, any custom post-type, taxonomy etc. 
Features:- 
Let visitors submit posts from anywhere on your site 
Easy integration shortcode to display the submission form 
captcha support protect from spam 
Post submissions may include title, category, author, post and image(s) 
Customize label In front End 
Enable/disable option for hide any option title, category, author, post and image(s)
Extra Features:- 
Post Type and taxnomy Support 
Publish post or Pending post 
Enable/disable Captcha 
Enable/disable Guest Posting 
Success Message 
Image size

Advance Guest Post

This plugin help your visitor to publish post and from frontend anywhere on your site. this plugin have so many feature like guest posting, captcha, u …

Ishimwe

This plugin acts as a quick front-end posting tool, allowing your visitors to easily submit posts and images from the front-end of your site, via a sidebar widget form, or a custom shortcode in a page or post of your choice. 
This is a very easy way to get your visitors to engage on your website. The idea came from a client who wanted a way to let members of their congregation post articles in the main church’s website 
Some of the niches this plugin can be useful include:
<ul>
<li>Blogging website with many contributors</li>
<li>Community webstes with user participation/interativity</li>
<li>Forum like websites that don’t want to use a fully featured forum module/plugin</li>
<li>Classified ads website where users post and review others’ posts</li>
</ul>
and more
This plugin is fully localizable with .po file included. The .mo for French is included
You can join/follow the discussion about the plugin on its home page at http://www.codiiv.com/forums/forum/plugins/sidebar-post/
<ul>
<li>Twitter: https://twitter.com/codiiv</li>
<li>Facebook: https://www.facebook.com/codiiv.com</li>
<li>Github: https://github.com/codiiv</li>
</ul>

Sidebar Posting

This plugin allows your visitors (logged in OR Not) to submit posts to your site via a simple sidebar widget form.

Advance Guest Post vs Sidebar Posting