Script-writing tools
The simple, get-down-to-work Fountain file format lets you write scripts with any plain-text editor. You can use the plain-text script as-is, or generate scripts in PDF and other formats.
Free Audio Resources
Find a wide variety of music at the Free Music Archive available under several creative commons licenses.
Add dimension to your audio drama with sound effects and environmental recordings from freesound.org.
Record, edit, and mix your scenes with Ardour, the free, open source, and cross-platform digital audio workstation.
Esperanto
UTOPIA is written and performed in English, but within the world of the story the universal language is Esperanto. You may hear it spoken in the opening and closing of each episode, and occasionally in the background of a scene.
Learn to speak Esperanto at Lernu.
Learn to speak Esperanto at DuoLingo.