whatsthebigidea

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Ideas
If someone has an idea they want to bring into the world, now they can start an idea working group on your WordPress! Allows a user to post an idea to an Ideas page at /Ideas/. A BuddyPress group with bbPress forum 
 are automatically created when this post is published!
-During installation, there is a prompt to auto-install the required plugins: User Submitted Posts, BuddyPress, bbPress and WordPress Classic Editor. 
 -The User Submitted Posts required plugin is used to provide the way for users to post an Idea. 
 -The users post appears in wp-admin to be edited and published by the site admin. 
 -When published, a BuddyPress group with bbPress forum are created automatically! 
 -Ideas posts are all displayed on the /ideas/ page. 
 -The Ideas page displays links to the BuddyPress group, a donate url, and has a description of the Idea. 
 -The data contained in the ideas.xml file is displayed on the /ideas/ page. 
 -The Ideas from any other sites can be displayed on the /ideas/ page. 
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<h3>Arbitrary section</h3>

BigIdeas

Allows a user to post an idea to an Ideas page at /Ideas/. A BuddyPress group with bbPress forum are automatically created when this post is published …

debabratsharma

Use Guest Post Plugin and allow your visitors to submit posts without registration . Anyone will be able to submit post and it will be added automatically as pending post. 
After reviewing you will be decide which posts approved for publish and which are rejected. Submitted posts will be included with name, email address, post title and other infos and the for the published post the 
the guest will get an email after it is published and alongwith that he/she will also get an pdf attached with his/her submitted information.
<h3>All Features:</h3>
<ul>
<li>Use this shortcode [guest-post] to display the form and accept submissions from frontend.</li>
<li>Guest Post Plugin will create a form where your guests can submit their posts.</li>
<li>Posts will be directly saved into WordPress database and will show up in Admin Dashboard as pending post with given Title.</li>
<li>Moderator will be able to review and approve them as needed.</li>
<li>Name and email will be added as custom field.</li>
<li>After post is published an email notification will be sent to the guest with the submitted data in a pdf alongwith an email template.</li>
<li>Simple and user friendly</li>
</ul>
Note: Please read full description for better use.
<h3>More User Guide</h3>
Create a new page/post with the name “Simple Guest Post” or whatever you like best.
If you don?t want to use custom redirect url or author then use this shortcode <code>[guest-post]</code> into the page/post and publish it. 
It will publish post under admin and redirect will be to homepage.
If you think this plugin is really helpful for you then give a 5 star review to say thanks.

Guest Post Plugin

Guest Post Plugin will help you to generate a guest posting form in the simple and easiest way.

BigIdeas vs Guest Post Plugin