Harmonic is a beautifully designed, open-source and fully featured client for Hacker News. It has a Material Expressive design, a wide feature set and many customization options.

Highlights
• Material Expressive design
• Log in to comment, vote and submit posts
• Customizable UI
• Search
• Smart link previews
• Optional AdBlock
• Tablet support
• Switch between Top/Best/New categories
• Fast comment loading
• Share and bookmarks posts
• Import/export bookmarks
• AMOLED dark mode
• Filter posts
• Hide jobs posts
• Optional thumbnails

Harmonic for Hacker News is not affiliated with Y Combinator.