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Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
EmailOctopus - Email marketing for less, via Amazon SES
TXT180 - TXT180 is a text message marketing for bulk SMS mobile marketing campaigns for businesses of all sizes.
Sociocs - Best customer communication tool for your business
Privy Text - Text message marketing for small & growing ecommerce brands