There are some, I've seen Periodical on F-Droid before, but I saw now there's another one called drip. Probably more out there, but both of those are also available on Google Play for people who aren't FOSS nerds like me. Source: about 2 years ago

Do you really need it hosted? Is a private app enough? For example, on Android, there's Periodical and I think it doesn't even have the internet access permission. Source: about 2 years ago

If you have an Android device, Periodical is a simple tracking app that does not have Internet permission so it literally cannot share your data. You can back up its data to a text file to restore if need be, and keep that backup off your device. However, if your phone backs itself up to "the cloud" you could still incriminate yourself. Source: about 2 years ago

I'm willing to work on a royalty share deal or a fixed fee (PFH), so I'm offering you an opportunity to submit me your work. The story that I connect with I'll do the graphic part for, finalize the audio and pay for the https://publishdrive.com/ fee so we can make some income together, even a little ;). Source: 12 months ago

Draft2Digital. https://www.draft2digital.com. It’s for E-books. They are testing a print service and I’m still on the waiting list. Publishdrive https://publishdrive.com. Never used, but they they charge a subscription instead of taking part of your royalties. Source: over 2 years ago

PUBLISHDRIVE: Publishdrive requires a monthly payment to publish your books. You get more royalty, but it will cost more each month. There is an App sumo coupon running around if you want to try it. I would be very cautious and read the fine print. I don’t use them. They are kind of a nightmare to deal with. Source: over 2 years ago