tpm-tools is a group of tools to manage and utilize the Trusted Computing Group's TPM hardware. TPM hardware can create, store and use RSA keys securely (without ever being exposed in memory), verify a platform's software state using cryptographic hashes and more.

ConsoleKit is a system daemon for tracking what users are logged into the system and how they interact with the computer (e.g. which keyboard and mouse they use).

PulseAudio, previously known as Polypaudio, is a sound server for POSIX and WIN32 systems. It is a drop in replacement for the ESD sound server with much better latency, mixing/re-sampling quality and overall architecture.

GObject Introspection is a project for providing machine readable introspection data of the API of C libraries. This introspection data can be used in several different use cases, for example automatic code generation for bindings, API verification and documentation generation.