®Penteract Audio Guide (Rep)
Penteract Audio Guide™ lets museums offer audio tours at no expense to the museum1. And lets visitors listen to audio tours from the comfort of their own phone. It frees museums from the need to deal with audio devices, and helps them be more accessible to the visually impaired.

Museums use a free app to upload audio files (and optionally images and text as well), and to create permit-codes for visitors, either one code per visitor or a reusable code for all visitors.

Uploader app:

Code-creator app:
(And coming to iPhone/iPad soon.)

1Only the software and service for making content available are free. Other expenses might be incurred such as a visitor's pass for testing your content, offering free passes to disabled persons, and third party expenses such as for network and voice-talent.