walkerOS serves as an open-source toolkit designed for event tracking and data collection, catering to developers, analytics engineers, and data teams engaged in the development of web applications and digital products. It effectively captures various events, including those from browsers, servers, and custom sources, utilizing a structured entity-and-action model. After capturing, it processes these events through transformation, validation, enrichment, and routing to diverse analytics platforms, advertising tools, APIs, and data warehouses. Teams can define their flows in code, manage user consent, and maintain instrumentation either alongside reusable UI components or directly within their application code. The comprehensive toolkit comprises both web and server components, a command-line interface, destination packages, as well as tools for testing and simulating event flows. Additionally, walkerOS supports self-hosted deployments while providing an optional hosted application for overseeing flows and deployments. To assist users, there is extensive documentation and community support, with the option of paid implementation and support services available through elbwalker. This makes it an incredibly versatile solution for teams looking to optimize their data collection processes.