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• Opera   - Browser for multiple platforms. Features include mail, news and ICQ clients, rss, IRC, projection mode, WML support, mouse gestures and extensive keyboard support.

• 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.
• Joe's Slim Software - Freeware programs by Josef W Segur, including OFE and O4FE, opera file explorers, also OpWic, an Opera windows controller.
• My Opera - Skins for Opera, forums, links, polls and daily comic.
• Opera Bug Report Form - Bugs found in any version on any platform can be reported here.
• Opera Fixes and Tweaks - Lots of bug fixes and tweaks for the mail client in Opera. You need to be competent with a hex editor, but the fixed files are also downloadable.
• 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.
• Opera for Mobile - Information and news about Opera's web browser for smartphones and PDAs.
• Opera for Symbian OS - Information including FAQ sections, bug lists and reviews for Opera 5 and 3.62 for the Symbian platform.
• Opera Public Mailing Lists - Opera mailing lists.
• Opera Show - Information about making presentations for display in the web browser, including an online generator, and software download.
• Opera Users FAQ - An independent FAQ compiled from regular questions and answers posted to the Opera mailing list.
• Opera Watch - A weblog covering the latest buzz on the Opera browser and its competition.
• Opera Web Browser Changelogs - Changelogs for the Opera web browser.
• Opera Web Browser Knowledge Base - Information to help you if you have a specific problem or a technical question about using Opera.
• Opera Web Browser WIKI - A collection of information relating to tips, customization, and technical details of the Opera web browser
• Opera Widgets - Small desktop applications for those using the Opera browser. Categories include web tools, games, music and news. Also, can create own widget.
• Opera's search.ini illustrated - Explains what all the entries in Opera's search.ini mean and how to add custom search engines.
• Quickshow - A presentation authoring tool. The presentations are displayable with the Opera web browser in OperaShow mode.
• Tutti all'opera (Away from the browsersaurii) - Discussion and essays about the Opera browser.

• 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. (May 27, 2002)