Botpress
FreeThe building blocks for building chatbots 
FreeFree tier
About Botpress
Botpress is an open-source platform for building next-generation chatbots and assistants powered by OpenAI. It provides a full suite of tools including a CLI, SDK, and API client for developing and deploying GPT/LLM agents. The repository contains public integrations maintained by Botpress, example bots built with the SDK, and plugins for extending functionality. Botpress Cloud offers a managed service for building assistants at scale, while the open-source codebase allows full customization and self-hosting.
Key Features
Open-source platform for building chatbots and assistants
Powered by OpenAI and GPT/LLM models
Command-line interface (CLI) for project scaffolding and deployment
Software development kit (SDK) and API client for custom bot development
Public integrations on Botpress Hub maintained by the team
Plugin system for extending bot capabilities
Example bots available as code using SDK and CLI
Active community with Discord support
Pros & Cons
Pros
- Free and open-source with full access to source code
- Integrates with OpenAI for advanced language capabilities
- Extensive integrations and plugin ecosystem
- Active community and Discord support
- CLI and SDK enable developer-friendly workflow
- Cloud option available for managed deployment
Cons
- Requires familiarity with CLI and TypeScript for custom integration development
- Documentation for local self-hosting may be less comprehensive than cloud offering
- Not a no-code solution; requires programming knowledge for advanced use
Best For
Building customer support chatbotsCreating AI-powered virtual assistantsDeveloping GPT/LLM agent applicationsPrototyping and deploying conversational interfacesIntegrating AI into business workflows