MailPoet

The HubSpot WordPress plugin is a free, all-in-one marketing, sales, and service solution that tightly integrates your WordPress site with the HubSpot CRM platform. Its core purpose is to help businesses grow by providing essential lead generation and customer management tools directly within the website. Key features include easy-to-create forms, pop-ups, and live chat functionality for capturing leads, as well as analytics and email marketing tools. The plugin's main strength is automatically syncing all contact data and interactions back to the central HubSpot CRM, offering a unified view of every customer relationship.

RafflePress is the most powerful and user-friendly giveaway and contest plugin for WordPress. Its core purpose is to help website owners grow their email lists, increase website traffic, and boost social media followers by running viral contests and sweepstakes. It features a drag-and-drop builder, pre-built templates, and powerful 'viral' actions where users earn extra entries for performing specific tasks like sharing, referring friends, or joining an email list. RafflePress is a dedicated tool for conversion-focused marketing through engaging promotions.

OptinMonster is a leading conversion optimization toolkit and lead generation plugin for WordPress, designed to help businesses turn website visitors into subscribers and customers. Its core purpose is to maximize lead capture through highly targeted campaigns like exit-intent pop-ups, floating bars, slide-ins, and gamified wheels. It offers a powerful drag-and-drop builder, detailed analytics, and advanced display rules based on user behavior (e.g., specific URLs, time spent, or cart abandonment), making it an essential tool for boosting email lists and sales conversions.

Mailchimp for WordPress (MC4WP) is the most popular WordPress plugin for seamlessly integrating a Mailchimp account with a website. Its core purpose is to help site owners grow their email list by allowing them to create user-friendly, highly customizable opt-in forms that connect directly to their Mailchimp audience lists. The plugin handles smooth synchronization of subscriber data and provides integration with various other forms (like comments, registration, WooCommerce), making list building effortless and centralized.