September 2010 - Maintenance update was released.The version EPUB 3 is also endorsed by the Book Industry Study Group (BISG), a leading book trade association for standardized best practices, research, information and events, for packaging of content.
EPUB file standards are maintained by the International Digital Publishing Forum(IDPF). In addition, there are a lot of compatible software available for smartphones, tablets and computers. For example, on Mac OS, the pre-installed Books software provides the support for opening such files. The format has been so common by now that it is supported by many e-readers and software applications. epub extension are an e-book file format that provide a standard digital publication format for publishers and consumers.