Vapor Toolbox adds two package dependencies, Vapor and Fluent SQLite, automatically into the project created with the default template.
You can add as many package dependencies as you need by appending the new package to the dependencies array. However, you have to use the Vapor update command to fetch the package and effect the changes if you have modified a package or added a new package to the dependency list.
If you run the swift package show-dependencies command on your Terminal, you can see that Vapor and Fluent SQLite have a long list of dependencies: