| Pt | Core module |
| Pt::Db | Transparent Database Access |
| Pt::Gfx | Graphics and Imaging |
| Pt::Gui | Graphic User Interfaces |
| Pt::Log | Configurable and thread-safe logging framework |
| Pt::Reflex | Object introspection, reflection and meta-objects |
| Pt::System | System programming |
| Pt::Text | Test Processing |
| Pt::Unit | Protocol and data driven Unit-testing |