Several applications are great for sending newsletters. Mailchimp is popular for its user-friendly interface and advanced features. You can use Sendinblue for automation and segmentation tools. MailerLite provides excellent templates and easy-to-use design options. ActiveCampaign excels in personalized email campaigns with advanced analytics. GetResponse offers strong email marketing tools and landing pages. Moosend helps with automation and personalized email content. Benchmark Email provides useful drag-and-drop functionality. Constant Contact is good for small businesses with easy list management tools. You should choose the application that best fits your business needs and budget for the best results.