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