Post as Guest - Creates a form (shortcode) to a page to allow guests to post content.
Create a stunning guestbook or testimonial page using the built in WordPress comment system.
Adds a BuddyPress-like guest bar to your WordPress site!
Switch between user accounts to xperience what you're users can and cannot do without logging in and out.
Hide/Unhide Menu for Guest/Member is a simple plugin that you can easily manage to hide or unhide menu for guest and member via css.
Show simple statistics.
Ciusan Restrict Widget can show message for user loggedin or for user not loggedin only in widget area.
Submit your post as guest user. Add featured image and other media to the post. Easy to use but very usefull.
Allows you to specify which post/page ID to display recent comments for (or show them all). Simple options for display format as well.
Register EDD guest customers with Contact Form 7 custom registration, disable registration for everyone else.
Create, update, delete posts and edit profile directly from the WordPress frontend.
Guest Post Express
Postrunner is a guest posting system connecting authors with site owners. This plugin facilitates the process of hooking a WordPress site into Postru
This plugin adds support for popular bbcode forum code to posts, comments, pages, bbpress 2.0 forums and buddypress activity and group forums.
Create a guestbook or local avatars or unique comments. The images be will resized on upload and originals deleted.
Visitors have to enter an invitation code to register on your blog. The easy way!
Adds a widget in the Dashboard's Widgets menu to place the Was Here App to display recent visitors in the sidebar.
Simple create an event with guestlist and signup.