Protocol buffers are a flexible, efficient, automated mechanism for serializing structured data - similar to XML, but smaller, faster, and simpler. You define how you want your data to be structured once, then you can use special generated source code to easily write and read your structured data to and from a variety of data streams and using a variety of languages. You can even update your data structure without breaking deployed programs that are compiled against the "old" format.

Vector-Optimized Library of Kernels is designed to help applications work with the processor's SIMD instruction sets. These are very powerful vector operations that can give signal processing a huge boost in performance.

session-token is a script, using the Session::Token module, to create session tokens, password reset codes, temporary passwords, random identifiers, etc.

Backend for the QtContacts API which stores contact information to a local SQLite database.

Ray Session is a GNU/Linux session manager for audio programs as Ardour, Carla, QTractor, Non-Timeline, etc...

App::Yath (Yet Another Test Harness) is an alternative to App::Prove, and Test2::Harness is an alternative to Test::Harness. It is not designed to replace Test::Harness/prove. Test2::Harness is designed to take full advantage of the rich data Test2 can provide. Test2::Harness is also able to use non-core modules and provide more functionality than prove can achieve with its restrictions.