deps.dev is an open-source package dependency database that provides information about software packages, including their dependencies and vulnerabilities. The service analyzes data from various package repositories, such as npm, PyPI, Maven, Cargo, NuGet, and Go, to build transitive dependency graphs. This allows for the identification of problems in any package that affects other software they depend on. deps.dev offers an API that can be used to access this data, providing information about packages, their dependencies, and versions. The service also includes a UI where users can visualize the data, including graph views and hierarchical layouts. deps.dev can be integrated into graph databases like Neo4j to analyze software dependencies and provide insights into package vulnerabilities and relationships.