| vital/algo | Abstract algorithm definitions |
| vital/bindings | C and Python bindings |
| vital/config | Configuration support code |
| vital/exceptions | Exception class hierarchy |
| vital/io | Classes that support reading and writing core data types |
| vital/kwiversys | Code that supports the OS abstraction layer |
| vital/logger | Classes that provide logging support |
| vital/plugin_loader | Classes that provide plugin loading services |
| vital/tests | Unit tests for vital code |
| vital/tools | Source for command line utilities |
| vital/types | Classes for the core data types |
| vital/util | Source for general purpose utility functions |