IceCream Ebook Reader software (version 4.21) is a free eBook reader that supports various eBook formats such as EPUB, MOBI, PDF, and FB2. The software allows users to customize the reading experience by adjusting font size, font type, and background color. It also has a built-in library where users can organize and manage their eBook collections. Additionally, IceCream Ebook Reader supports bookmarks, highlighting, and note-taking features to enhance the reading experience.