OptinMonster is the best lead-generation plugin for WordPress. It's used by over 1m websites and allows you to create attention grabbing forms to drive lead-generation. Easily run A/B tests to identify top performing popups, and use other features like the "spin-the-wheel" popup to capture leads.
Klaviyo is the best in class email marketing solution for eCommerce. It's powerful because it connects to your store, and you can create awesome customer segments based on past purchasing behaviors, customer preferences, and even future predictions of spending.
Refersion is an affiliate tracking platform that manages your influencers and affiliates. It integrates with major eCommerce platforms and provides you with a place to bring on affiliates, create different offers, calculate commissions, and track how much an affiliate needs to be paid.