Cacher is the code snippet organizer for pro developers

http://www.wpsitecare.com/best-wordpress-plugins/

https://www.relatedpostsforwp.com/ (premier and free versions)

https://wordpress.org/plugins/display-widgets/ (9.19.17 - backdoor vulnerability: do not use)

https://wordpress.org/plugins/widget-options/

Restrict Widgets (dFactory)

https://wordpress.org/plugins/genesis-featured-image-header/

Genesis Simple Hooks

Forums: bbPress and buddypress are the two most common plugins to setup a forum. 
bbPress has more support so it may be good to start.

Affiliate links:
https://wordpress.org/plugins/thirstyaffiliates/
https://wordpress.org/plugins/easy-affiliate-links/
https://wordpress.org/plugins/pretty-link/

https://wordpress.org/plugins/genesis-easy-columns/ - provides buttons for column classes shortcodes (good for clients)

Adding support for WooCommerce in Genesis - you are advised to use Genesis Connect for WooCommerce
https://wordpress.org/plugins/genesis-connect-woocommerce/