What wordpress plugin is this?

[ShoutGroup]

What wordpress plugin is this?

http://www.johnchow.com/author/kwan/

I want to be able to link to all my authors posts on the side panel.

[aaronjj]

It's not a plugin. Wordpress does that by default. you can even use wp_list_authors in your sidebar to list and link to them. The short bio can be created by using the information in the author's profile page in the admin.