Welcome to the central PET resources page
PET is an open-source runtime system for processing with unification based grammars. PET is a core component of the Deep Linguistic Processing with HPSG Initiative (DELPH-IN) open-source repository.
If you don't know what PET is, or consider yourself rather a user than a developer, you should look into the User Documentation. This page also contains information about how to install and compile the source code and which external packages or libraries you will need to do so successfully.
If you want to participate in PET development, even if it's only by adding new tickets, send a mail to kiefer (at) dfki.de, describing your background and what your interest in PET is, so you can be given the proper rights for these pages and the repository. There is also a Developer Resources page containing the programming style guide for this project (not yet implemented on the current code base) and some other tips & informations concerning PET development
There is also a mailing list for discussion and information about recent development in pet located at: http://lists.delph-in.net/mailman/listinfo/pet
There have been no release tarballs for quite a while, the latest is hopelessly outdated compared to the version in the repository, which is open for download.
This site hosts a subversion repository with the latest development sources in the source:pet/main directory. For details about the latest changes on the source code level, look into the CHANGELOG in the source tree or check the ticket system.
To access the svn repository directly from an svn client, use the repository URL https://pet.opendfki.de/repos/pet/
Aside of the tickets, there was some planning going on about the near future of PET on the last DELPH-IN meeting. A summary of this meeting can be found on the Road Map.
For more information about the trac system that is used to run this site, and how to use it, read AboutTrac