Rasa
Rasa Open Source provides a highly capable open source platform for building chatbots.
Botman
BotMan is an open-source PHP framework for building chatbots that works across multiple messaging platforms like Facebook Messenger, Slack, Telegram etc.
It allows developers to write chatbot logic once and connect it to various messaging services without changing any code. This saves significant development time.
Key advantages are flexibility, support for natural language processing (NLP), and easy integration. Main disadvantage is lack of visual bot builder for non-developers.
BotMan is free and open-source. Revenue comes from optional paid services like BotMan Studio which provides additional tools.
Very positive reviews praising flexibility, NLP support and quick setup. Some limitations around non-text responses.
Overall, BotMan is the most popular PHP chatbot framework with an impressive cross-platform approach and active open source community support.
Pricing Model:
Freemium
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