Opens Todoist(https://todoist.com) in the sidebar. This is an unoffical extension.
Manage your tabs in the sidebar!
Bookmarks Manager and Viewer
An elegant bookmark manager with fuzzy search and more
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).
Too many open tabs? Manage your tabs, regain your sanity and improve your browsing experience with tabzen
A sidebar extension for tab management.
ICQ for Sidebar
Run ICQ Web in Sidebar
Prayer times | مواقيت الصلاة.
معرفة مواقيت الصلاة
Site Settings Sidebar
Site specific settings on your sidebar.
The best way to share things well surfing the web - Simplest possible way.
2048 Mini game
The game 2048
This widget uses Logos Bible Software's Biblia.com Bible API service to get the Bible text
Monthly Prayers Timetable
Islamic Monthly Prayers Timetable with HTML5 localStorage
The History Panel
An extension that puts the browser history in the sidebar, sorted by date.
Simple notes in a panel, with a context menu item to copy text to a note.
Google Tasks on sidebar (not official)
Minimalistic todo extension for your sidebar
Simple Vertical Tabs
Simple Vertical Tabs
Simple Bookmark Sidebar
This extension shows your bookmarks in Opera's sidebar.
Free File Sender
Free file transfer
Mobile version Inoreader.com on sidebar (not official)
Utilities for even more powerful web browsing. Search all open tabs, retrieve previously closed tabs, and make notes.
Follow your favorite TV show. For Opera 29+ only.
The sidebar with all the Radioigor and Videoigor music channels.
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.
Freelyshout Lite On Sidebar
This is an unoffical extensions. Freelyshout for Opera Sidebar. Freelyshout is social media platform.
A tool for web developers to preview blend modes on different page elements.
Loads up Dharmesh Patels's excellent Web App for Hackernews on the Sidebar