TinyPNG is an online image compression tool created in the Netherlands in 2014, typically reducing file size by 50-80% through smart lossy compression, with 500 free API compressions per month - a common choice for front-end and website image optimization.
Newsletter Glue is a WordPress newsletter plugin launched in 2016 that lets users create emails in the WP editor and send and track them automatically through Mailchimp, ConvertKit, and other providers.
MailPoet is a native WordPress newsletter plugin launched in 2011 and used by 600,000+ sites, featuring a drag-and-drop editor, automation workflows, and WooCommerce integration with a free plan for 500 subscribers.