Hi all! I recently developed
news2reader, an open-source OPDS server that lets you browse links from link aggregators and bookmark services (currently just Hacker News and Pocket) in compatible reading devices/apps (such as KOReader).
Web articles fetched from the catalog are automatically converted into clutter-free, readable EPUB content (using the same implementation that powers Reader View in Firefox). Direct links to PDF/EPUB files are downloaded as-is, without any conversion.
It isn't perfect, but it meets my needs quite well and I wanted to share it in case others find it useful too! It's MIT licensed and can be run using either Node (v18 or higher) or Docker (images are available for x86 and ARM, so you can run it natively on a Raspberry Pi / Synology / etc.). Instructions and screenshots are in the README, and I'll try to copy a few images as thumbnails/attachments below.
Happy to answer questions or accept contributions with enhancements!