Niche
Download WooCommerce Product Builder v2.2.6 – Custom PC Builder – Product Configurator
WooCommerce Product Builder is a plugin that allows your customers to build a full product set from small parts step by step. The plugin works base
Free 
Download Mailster v4.0.9 – Email Newsletter Plugin for WordPress
Mailster is an easy to use Email Newsletter Plugin for WordPress. Create, send and track your Newsletter Campaigns without hassle.. Demo:
Free 