Probably, you have always used Word or Open Office to write texts. Nowadays, there are many new writing programs for indie-authors — here are three programs that self-publisher can use for editing and proofreading their books.
Scriveneris a word-processing program and outliner designed for authors. Scrivener has the ability to export text into multiple document formats such as “mobi” or “ePub”.
Storyistis similar to “Scrivener”, but it is available for iPhone and iPad. You can store your book in your Dropbox and it will always be with you wherever you go on all your all devices.
Papyrusis a professional word processor and the only one with “Duden Korrektor”, as well as grammar and spell checker, and thesaurus. Furthermore, Papyrus offers style analysis. Version eight of the software allows you to convert text files to eBook formats.