Paxtools
Paxtools is a library for accessing and manipulating BioPAX. Software tools that use BioPAX, such as exporters, importers, analysis algorithms or editors can use Paxtools as their core BioPAX API. Paxtools supports BioPAX Level 2, and can automatically convert Level 1 models to Level 2. The latest release candidate for BioPAX Level 3 is fully supported, but it is still in beta as BioPAX Level 3 is not finalized yet.