1. Book Brush
The guys behind the image design app are constantly innovating new features that are actually helpful. From expanding their background image offerings to animations to book trailers to book covers to one-click background removal. The app was built specifically for authors who aren't graphic designers, which gives them a leg-up on other design sites. If you're doing your own marketing creative, I highly recommend this very easy-to-use app. They offer free features, pay-as-go credits, and two levels of annual subscriptions.
Note: Canva.com is also a good image design site with free, pay-as-you-go, and subscription levels. However, their audience is a general audience, thus lack book-specific features.
2. Book Funnel
This is a distribution site that allows you to put digital books in readers' hands. They handle the hosting and tech support. Billing is done through your preferred service (e.g. Paypal Integration) if you want to get into Direct Sales. They offer the ability to bundle, coupon codes, eARCs, etc. Have a newsletter and want to give new subscribers a free story? Use this service. They take the headache out of delivering your finished product to readers. They offer free features and subscription-level features.
3. Dropbox
Back up your files. Back up your files. Back up your files. Back up your files. Back up your files. Keep a copy on a thumb drive. Keep a copy on a cloud. Back up your files. Back up your files. Back up your files. Back up your files. Back up your files.
