Opens Todoist(https://todoist.com) in the sidebar. This is an unoffical extension.
Sidebar for Google™ Search
Easy Access to Google search via Sidebar UI
A sidebar extension for tab management.
All Image Download. Image Zoom. Expand Thumbnail and Audio and Video. Expand the short URL. Override Referer. Extend BBS. etc...
Too many open tabs? Manage your tabs, regain your sanity and improve your browsing experience with tabzen
ICQ for Sidebar
Run ICQ Web in Sidebar
Simple notes in a panel, with a context menu item to copy text to a note.
Free File Sender
Free file transfer
The best way to share things well surfing the web - Simplest possible way.
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).
Simple Bookmark Sidebar
This extension shows your bookmarks in Opera's sidebar.
2048 Mini game
The game 2048
Minimalistic todo extension for your sidebar
Google Tasks on sidebar (not official)
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)
Loads up Dharmesh Patels's excellent Web App for Hackernews on the Sidebar
Site Settings Sidebar
Site specific settings on your sidebar.
The History Panel
An extension that puts the browser history in the sidebar, sorted by date.
Monthly Prayers Timetable
Islamic Monthly Prayers Timetable with HTML5 localStorage
Follow your favorite TV show. For Opera 29+ only.
Adds notes managed by tagging without hierarchized tree to sidebar.
The Stories (sidebar edition)
Smart and beautiful tool for keeping links. Create a story for every ocasion!
Utilities for even more powerful web browsing. Search all open tabs, retrieve previously closed tabs, and make notes.
Browse technology news on Techmeme in the sidebar.
Freelyshout Lite On Sidebar
This is an unoffical extensions. Freelyshout for Opera Sidebar. Freelyshout is social media platform.
Simple Vertical Tabs
Simple Vertical Tabs
The sidebar with all the Radioigor and Videoigor music channels.