Google Docs – this is a great program to use if you have a gmail account (even if you don’t, it’s worth signing up for. It’s all free!) Documents that you create are automatically stored in Google Drive.
MS Word – I used this to write and format my book. It’s part of the Office 365 Suite.
Open Office Writer – a great free alternative to MS Word (part of the Open Office Suite).
Dropbox – This is a free cloud storage program. It will create a dropbox folder on your PC – keep your working documents there and they will be automatically saved to the Dropbox server as you work on them (you can see them online).
Adobe InDesign – If you pay someone to format your book, this is most likely what they will use. Expensive and not easy to use.
Jutoh – Excellent little program that is inexpensive for formatting your eBooks. It’ll create any format you need (ePub for Apple, mobi for Kindle, etc).
macincloud – An online cloud service that will give you a mac computer through your browser. I used this to get my book into iTunes.
Audible – If you decide to create an audio book yourself, this is fantastic and free!