botwick - Build your own SMS-based text bot
Qiscus - Engage your customers from your own apps and mainstream chat apps like Whatsapp, LINE, Facebook Messenger, Telegram, Email, Twitter, Instagram, etc. and centralize all chats into a single dashboard.
Estherbot - Transform your resume into a bot.
WeChat API - WeChat API and SDK allow developers to access and integrate the functionality of WeChat with other applications.
Bot Store - A marketplace for ready-to-customize chatbot templates.
Skygear Chat - Build full-featured messaging apps fast.