Opera Widgets
- Small desktop applications for those using the Opera browser. Categories include web tools, games, music and news. Also, can create own widget.
- http://widgets.opera.com/

Opera Show
- Information about making presentations for display in the web browser, including an online generator, and software download.
- http://my.opera.com/community/dev/operashow/

Opera Bug Report Form
- Bugs found in any version on any platform can be reported here.
- https://bugs.opera.com/wizard/

Joe's Slim Software
- Freeware programs by Josef W Segur, including OFE and O4FE, opera file explorers, also OpWic, an Opera windows controller.
- http://users.westelcom.com/jsegur/

Opera Watch
- A blog covering the latest buzz on the Opera browser and its competition.
- http://operawatch.com/

Opera Web Browser WIKI
- A collection of information relating to tips, customization, and technical details of the Opera web browser
- http://nontroppo.org/wiki/Opera7

Opera Web Browser Knowledge Base
- Information to help you if you have a specific problem or a technical question about using Opera.
- http://www.opera.com/support/service/

Opera Web Browser Changelogs
- Changelogs for the Opera web browser.
- http://www.opera.com/docs/changelogs/

Opera for Mobile
- Information and news about Opera's web browser for smartphones and PDAs.
- http://www.opera.com/products/mobile/

Opera Public Mailing Lists
- Opera mailing lists.
- http://list.opera.com/mailman/listinfo/

Opera for Symbian OS
- Information including FAQ sections, bug lists and reviews for Opera 5 and 3.62 for the Symbian platform.
- http://mobileopera.com/

Quickshow
- A presentation authoring tool. The presentations are displayable with the Opera web browser in OperaShow mode.
- http://philburns.com/quickshow.html

GreyMagic Security Advisory: Reading Any Local File in Opera
- Security vulnerability in Opera 6.01 and 6.02. Describes how a character entity can be used to upload an arbitrary local file to a remote server, without the user's knowledge.
- http://sec.greymagic.com/adv/gm001-op/

Bookmarklets for Opera
- Free tools for power surfing. Each tool is a small JavaScript application which you can bookmark directly from the page and use from your Bookmarks or Hotlist.
- http://www.philburns.com/bookmarklets.html

Opera for Linux Browser FAQ
- Answers frequently asked questions regarding Opera for Linux. Many of the tips and tricks are applicable to all platforms, such as how to customize search queries and URL filtering.
- http://www.schrode.net/opera/tips/tips.html

Opera's search.ini illustrated
- Explains what all the entries in Opera's search.ini mean and how to add custom search engines.
- http://www.schrode.net/opera/search/search_ini.html

My Opera
- Skins for Opera, forums, links, polls and daily comic.
- http://my.opera.com

Tutti all'opera (Away from the browsersaurii)
- Discussion and essays about the Opera browser.
- http://www.searchlores.org/tuttiope.htm

Opera Users FAQ
- An independent FAQ compiled from regular questions and answers posted to the Opera mailing list.
- http://www.hallvord.com/opera/