Chaos in a Can

This is a list of most of the stuff I've made to extend Opera. Also, check my plans for a rarely-updated list of what I'm working on.

Extensions
AutoStack - Opens new tabs in the stacks from which they were opened
Extensions page - Support and comments page

Media Keys - Controls Internet radio services with keyboard shortcuts
Extensions page

Open With Long-Click - Opens tabs in the background by clicking and holding on links
Extensions page

Reverse Image Search - Adds a context menu item to search for similar images.
Extensions page

Song Notifier - Displays a notification when a new song plays in Grooveshark
Extensions page - Support and comments page - Github

Tab Vault - Store tabs for later without cluttering your tab bar.
Extensions page - Support and comments page - Notes on translating Tab Vault - Github

Text Shortcuts - Enter accented characters with "Ctrl+Accent, Character" shortcuts like in Microsoft Word. Also lets you define your own shortcuts to enter any text.
Extension page - Support and comments page

UserScript Converter - Automatically turn user scripts into extensions.
Extension page - Github

Extension Libraries
Windows and Tabs API Extensions - Useful methods for Opera 12.00's new API
Github

OperaExtOptions - A library for painlessly creating an options page for your extension
Github - My Opera post

OperaLink.js - A JavaScript library for communicating with Opera Link.
Github - My Opera post

Widgets
Search Organizer - Reorder your Opera search engines.
CSS Fix - Automatically generate CSS patches for sites that use vendor-specific properties.

Utilities
Opera Skin Tweak - Python app that tweaks an existing skin. It has a small number of tweaks, but with a basic knowledge of Python, you can add your own.