Opens Todoist(https://todoist.com) in the sidebar. This is an unoffical extension.
Too many open tabs? Manage your tabs, regain your sanity and improve your browsing experience with tabzen
A sidebar extension for tab management.
Sidebar for Google™ Search
Easy Access to Google search via Sidebar UI
Simple notes in a panel, with a context menu item to copy text to a note.
ICQ for Sidebar
Run ICQ Web in Sidebar
Simple Bookmark Sidebar
This extension shows your bookmarks in Opera's sidebar.
Simple Vertical Tabs
Simple Vertical Tabs
Site Settings Sidebar
Site specific settings on your sidebar.
2048 Mini game
The game 2048
Utilities for even more powerful web browsing. Search all open tabs, retrieve previously closed tabs, and make notes.
Monthly Prayers Timetable
Islamic Monthly Prayers Timetable with HTML5 localStorage
The extension allows you to listen GIKRadio directly in the browser. Walk on the Internet and listen good music! Request Song from sidebar (press CTRL+SHIFT+S).
Minimalistic todo extension for your sidebar
Free File Sender
Free file transfer
Google Tasks on sidebar (not official)
The best way to share things well surfing the web - Simplest possible way.
Adds notes managed by tagging without hierarchized tree to sidebar.
The History Panel
An extension that puts the browser history in the sidebar, sorted by date.
Loads up Dharmesh Patels's excellent Web App for Hackernews on the Sidebar
This widget uses Logos Bible Software's Biblia.com Bible API service to get the Bible text
Prayer times | مواقيت الصلاة.
معرفة مواقيت الصلاة
Mobile version Inoreader.com on sidebar (not official)
Quick History Redux
A Redux (bug fix) for gucio1007's "Quick History". It shows your browsing history in the browser sidebar.
The sidebar with all the Radioigor and Videoigor music channels.
Browse technology news on Techmeme in the sidebar.
The Stories (sidebar edition)
Smart and beautiful tool for keeping links. Create a story for every ocasion!
Follow your favorite TV show. For Opera 29+ only.
A tool for web developers to preview blend modes on different page elements.