Fluent Reader

It is free for Mac, Windows and Linux if you download it from GitHub, and it’s paid ($2) for Android and iOS.

Fluent Reader is a modern, cross-platform, and open-source desktop RSS Reader.

Features:

*A modern UI inspired by Fluent Design System with full dark mode support.
*Read locally or sync with self-hosted services compatible with Fever or Google Reader API.
*Sync with RSS Services including Nextcloud News, Inoreader, Feedbin, The Old Reader, BazQux Reader, and more.
*Importing or exporting OPML files, full application data backup & restoration.
*Read the full content with the built-in article view or load webpages by default.
*Search for articles with regular expressions or filter by read status.
*Organize your subscriptions with folder-like groupings.
*Single-key keyboard shortcuts.
*Hide, mark as read, or star articles automatically as they arrive with regular expression rules.
*Fetch articles in the background and send push notifications.