BookToReader is a content-delivery app developed by author and nerd, Chris Rosser.
The idea began life after Chris switched from MailChimp to Mailerlite and discovered the otherwise excellent service didn't provide file hosting. Originally, the intent was to create a basic download manager that uses obfuscated URLs, but eventually Chris began to add things like landing pages and MailerLite integration. Ultimately, the aim is to enable Chris, as an author and blogger to give readers and subscribers content without relying on third-party services.
Chances are BookToReader will always remain a personal project, but since other authors have expressed interest, a limited, invitation-only beta is currently in progress. If you're interested in participating, reach out to Chris via his website.