Tars - TARS enables users to create chatbots that replaces regular old webforms.
Good Landing Page - Curated landing page examples for design inspiration
Phonexia Voicebot Suite - Phonexia Voicebot Suite is an all-in-one voicebot-building solution for the rapid, on-premise development of highly sophisticated conversational AI interfaces for contact centers and other automated systems.
Landing Page Checklist - Build your landing page with these 100+ tools
Dialogflow - Conversational UX Platform. (ex API.ai)
The Landing Page Cookbook - A guide for makers who want to create better landing pages.