ExpressDigiBooks 4.5 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. This free software for Mac OS X is a product of Express Publishing. ExpressDigiBooks for Mac lies within Education Tools, more precisely Teaching Tools.
From the developer:
Express DigiBooks is an innovative and motivational way to educate learners of all ages. It creates a friendly digital environment to enhance cooperation among students, teachers, and parents/guardians. Students of all language levels become more engaged in the educational process through a carefully crafted, gamified learning experience.
You may want to check out more Mac applications, such as Express DigiBooks, which might be similar to ExpressDigiBooks.