...
- PDI Development resources: To get you everything you need to start developing today.
- PDI Plugin Development: in case you want to develop extensions to PDI called plugins.
- Integrating PDI Integration: describes various ways to integration integrate PDI in your own Java software.
- PDI Architecture: description of the PDI architecture and the architecture of its individual components.
- PDI Rows Of Data: Description of how rows, fields and datatypes are represented in PDI
You can also find the SDK in Github