There are a number of software applications for the construction of eBooks:

•iBook author – Apple’s free propriety software but the resulting .iBooks files can only be viewed on a Mac desktop or iPad although ePub3 templates are now available from iBook Author

•Book Creator – a website for Android devices, Windows PCs, free for up to 40 eBooks; and an app for iOS devices

•Kotobee Author – a versatile eBook creator – the resulting eBooks run on any device including eBook readers – free to trial

Free guides are available from the iBook store