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
All Image Download. Image Zoom. Expand Thumbnail and Audio and Video. Expand the short URL. Override Referer. Extend BBS. etc...
A sidebar extension for tab management.
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.
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
The best way to share things well surfing the web - Simplest possible way.
Free File Sender
Free file transfer
Google Tasks on sidebar (not official)
Prayer times | مواقيت الصلاة.
معرفة مواقيت الصلاة
Minimalistic todo extension for your sidebar
Monthly Prayers Timetable
Islamic Monthly Prayers Timetable with HTML5 localStorage
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.
Mobile version Inoreader.com on sidebar (not official)
This widget uses Logos Bible Software's Biblia.com Bible API service to get the Bible text
Simple Vertical Tabs
Simple Vertical Tabs
The Stories (sidebar edition)
Smart and beautiful tool for keeping links. Create a story for every ocasion!
Adds notes managed by tagging without hierarchized tree to sidebar.
Utilities for even more powerful web browsing. Search all open tabs, retrieve previously closed tabs, and make notes.
The sidebar with all the Radioigor and Videoigor music channels.
How to get to Heaven
Find out how to get to heaven.
Follow your favorite TV show. For Opera 29+ only.
A tool for web developers to preview blend modes on different page elements.
Freelyshout Lite On Sidebar
This is an unoffical extensions. Freelyshout for Opera Sidebar. Freelyshout is social media platform.