PublishPress Authors allows you to add multiple authors and guest authors to WordPress posts
PublishPress AuthorsWordPress only allows you to add one author to each post. With PublishPress Authors, you can add many authors to one WordPress post. You can create detailed author profiles with fields and custom layouts. Using PublishPress Authors, you can also add Guest Authors who don’t need an account on your site.

MyCred Addons Bundle – Top Rated WordPress Points Management System Pack
Top Rated WordPress Points Management System
myCred makes it simple to create a loyalty program or gamify your website so that you can increase the average customer value with less marketing effort.