BotStar - Powerful platform for designing & developing chatbots visually with smart training.
Tools For Bot Analytics
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.
Tools For Bot Conversation Mockups
Bot Society - Bot conversation Mockups for presentation and demo.
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.
Libraries
General
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)