Onyx Gallery

Onyx is an open source Ruby on Rails based image gallery. It is designed to be clean and intuitive, flexible, customizable, and quick.

Features:

Customizable Themes
Organize Images by Category/Tag
Secure Admin area
Upload images from your computer or a direct URL
Built-In RSS feed generator
Cool Image Viewer & Slidehow
Comments for each Image
Easily Enable/Disable Dummy Watermarks
Floating Image Tooltips
Multiple File Uploads
Image Tagging
Image Effects(Black & White, Sepia, Rotation, etc.)