Bungo Search lets you search free e-books on Project Gutenberg by Time-to-Read. You can search for example: Mark Twain's short-short works of 10min to read.
Nonfik is a gated content library, built on discussion-worthy freebies and powered by social reading functionality like: 📚 A shareable bookshelf 💬 Notes & discussions ⭐ Expert & community reviews 🗂️ Custom collections for onboarding or educating peers