Downloading Livebook 3.6 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The actual developer of this Mac application is School Improvement Network. The software lies within Education Tools, more precisely Teaching Tools.
From the developer:
LiveBook is a multimedia learning experience that combines author interaction, video, audio, polls, downloadable content, notes, and forums with the author’s text. The text is fully customizable and editable by the author, and you can collaborate with an online community of readers that makes the LiveBook learning experience dynamic and fulfilling.
You may want to check out more Mac applications, such as eduMap, FRS Clocks and Time or ExamView Pro, which might be similar to Livebook.