I prefer minimalism so I have created three different flavors of it depending upon the particular use-cases and I have linked the most minimalist one as the submission.
If someone is interested in a Epub/pdf reader, I have recently made one: https://epub.mirror.forum/
After making that, I was also feeling the need of having standard book downloads and seeing this project as well. I have added it first using cors.sh: https://guten.mirror.forum
I have also added a cf worker native solution which focuses on the search aspect only as well: https://gutencf.mirror.forum
Feel free to ask me or give me any feedback or which one you might like more within this somewhat A/B testing experiment of mine and I just hope that it might be useful to anybody.
Cheers and take care!