BotSailor

BotSailor is a chatbot builder for WhatsApp, Facebook Messenger, Instagram DM, and Telegram, and it's free for up to 1,000 subscribers. It's not just a chatbot builder; it's a chatbot marketing software with Live Chat. BotSailor can be used to broadcast unlimited WhatsApp messages for promotions, newsletters, or any kind of business communication. It offers a chat widget that can be used on websites to grow subscribers and provide instant replies to customer queries.