Debian

The Pyra will, as shipped, run Debian, using the official Debian ARMhf repo for most software, with hardware-specific packages available from a repo on pyra-handheld.com.

Images and Installer at http://packages.pyra-handheld.com/images/

List of software in Debian at https://packages.debian.org/jessie/ (check for armhf as the architecture)

Installing/updating software

To install software on the command line, try searching for a keyword like this: apt-cache search synthesizer. Then run sudo apt-get install zynaddsubfx to install the program. Then type in zynaddsubfx to run it. Try to keep your list of available software updated with sudo apt-get update, and keep your installed programs up-to-date via sudo apt-get upgrade. (For those new to Linux, this is a very quick and painless process compared to other OSes.)

Alternatively, there are beginner-friendly package-managers such as Aptitude (curses) and Synaptic (GUI) for users who feel uncomfortable with command-line tools. Keeping things up to date, searching for available software, and installing it follow the same ideas as above, but with a graphical user interface.

Note

It's important to keep your Debian software up-to-date as above, but also your DBP Pyra-repository software as well.