EventCatalog, an open source tool for documenting event-driven architectures, says version 5 moves the project from MIT to the Business Source License 1.1 as it abandons the open-core split of a free catalog with paid plugins, integrations and enterprise features. The company says AI changed the ecosystem enough that the old model no longer fits: v5 ships integrations, an MCP server, an assistant and SSO in one product, stays free for individuals, open source projects, education and organisations under $10 million in revenue or funding, and costs from $5,995 a year for larger organisations based on how many teams use the catalog, with AI agents included. Version 4 remains MIT, every v5 release becomes MIT four years after it ships, and the licence FAQ says organisations with $10 million or more in revenue or raised funding need a commercial licence for production use, including internal catalogs.
EventCatalog drops MIT for a Business Source License in v5
EventCatalog, an open source tool for documenting event-driven architectures, says version 5 moves the project from MIT to the Business Source License 1.1 as it abandons the open-core split of a free catalog with paid plugins, integrations and enterprise features. The company says AI changed the ecosystem enough that the old model no longer fits: v5 ships integrations, an MCP server, an assistant and SSO in one product, stays free for individuals, open source projects, education and organisations under $10 million in revenue or funding, and costs from $5,995 a year for larger organisations based on how many teams use the catalog, with AI agents included. Version 4 remains MIT, every v5 release becomes MIT four years after it ships, and the licence FAQ says organisations with $10 million or more in revenue or raised funding need a commercial licence for production use, including internal catalogs.
Source: Eventcatalog