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Platform Documentation

wit.ai - Easily create text or voice based bots that humans can chat with.
Botkit - Botkit eases the process of designing and running bots that live inside Slack.
Dialogflow - Build natural and rich conversational experiences.
Text It - Visually build SMS and voice apps to engage your customers.
Chatfuel - The intuitive bot builder with AI navigation. No coding required.
Watson - Bring the power of cognitive computing to your apps.
Beep Boop - Beep Boop is a simple hosting platform for your Slack and Messenger bots.
Dexter - Get a Slack bot that responds with answers from your own Google Sheet.
Converse AI - Respond to customer questions instantly with intelligent chatbot technology.
Gupshup - Easiest & fastest way to build & deploy your bots on any channel.
Haven OnDemand - They are similar APIs as that of watson, but far well documented and have a freemium version.
Recast.AI - Collaborative Bot Platform for developers: build conversational bots easily.
ChatterBot - Machine-learning based conversational dialog engine build in Python
Google Cloud Platform - Use sentiment analysis on a block of text to add decision tree logic for a conversation bot.
Messenger Demo Viewer - Demo FB Messenger bots without showing personal chats
BotStar - Powerful platform for designing & developing chatbots visually with smart training.

ChatMetrics - Engagement platform for bots. ChatMetrics allows to reactivate inactive users and improve retention by sending "smart" notifications to users.
Dialog - Chatbot analytics platform for marketers to drive user engagement, retention, conversion and understand behavior.
Dashbot - Actionable Bot Analytics: Increase user engagement, acquisition, and monetization.
Botmetrics - Grow and retain your chatbot customers. Enterprise grade opensource conversational analytics, marketing automation, and CRM rolled into a single snippet of code.

Bot Society - Bot conversation Mockups for presentation and demo.
Bot Sketch - Sketch Chatbot UI (Mac Only)
Botframe - a playground to design bots (conversation mockups).
Botmock - Create conversation flows and interactive prototypes from a simple drag and drop editor, then share or test those prototypes and get feedback in one centralized location.
BotStar - A fullfledged chatbot platform but the visual editor can be used as a mockup tool as well.

Qtypes - Rule based Answer Type classification system in Node.js.
BotKit - Botkit is a toolkit for making bot applications.
Claudia Bot Builder - Create chat bots for FB, Slack, Skype and Telegram and deploy to AWS Lambda in minutes.
Universal Bot Framework - Create crossplatform chat bots for FB Messenger, Kik, Telegram and Skype with just one logic.
Pandorabots - web service for building and deploying chatbots.
Microsoft Bot Framework - Node.js/.NET library for building, connecting, testing, and deploying powerful and intelligent bots.
Bottender - Make Bots in Your Way, Fast and Flexibly.
BotMan - PHP Bot Framework supporting over a dozen platforms (FB, Instagram, MS Bot Framework, etc)

There is a bot for that - Search engine for bots
ChatBottle - Chatbots search engine
BotList - An App Store For Bots.
Slack Store - The official Slack bot store.
Telegram Store - The unofficial Telegram bot store.
Product Hunt - Product Hunt bot list.
Dashbot - Dashbot bot directory.
Skype Bot Directory - The official list of skype bots by Microsoft Bot Framework
Teamchat - Bot store by teamchat.
Discord Bots - An unofficial list of discord bots.
Discord Bot List - An unofficial list of discord bots.
Telegram Botlist - A bot list for Telegram.
Mayo Bot List - An unofficial list of discord bots.
Terminal Bot List - An unofficial list of discord bots.

ChatbotTest - Chatbottest is an open source guide that helps you identify chatbot's design issues under 7 different categories.
BotTesting - Test your bot! Send your email and bot link to us, we’ll examine your bot’s performance and usability