I haven't tried it yet, but there's wxHtmlWindow. I think there's also wxWebKitCtrl (unwrapped) which is more osx friendly apparently.
wxHtmlWindow does have its limitations:
"wxHtmlWindow is used by wxWidgets’ built-in help system, and it is also a great control to use in your applications whenever you need to display formatted text and graphics, such as reports. It can display a useful subset of HTML, including tables, but not frames. Features include animated GIFs, high-lighted links,fonts,background color,nested lists,centering, right-alignment, horizontal rules, character encoding support, and more. It doesn’t support style sheets,but you can normally achieve the effects you want by writing or generating the appropriate tags. HTML text is selectable and can be copied to the clipboard or returned to the application as plain text." (from the wxWidgets Programming pdf)
wxHtmlWindow does have its limitations:
"wxHtmlWindow is used by wxWidgets’ built-in help system, and it is also a great control to use in your applications whenever you need to display formatted text and graphics, such as reports. It can display a useful subset of HTML, including tables, but not frames. Features include animated GIFs, high-lighted links,fonts,background color,nested lists,centering, right-alignment, horizontal rules, character encoding support, and more. It doesn’t support style sheets,but you can normally achieve the effects you want by writing or generating the appropriate tags. HTML text is selectable and can be copied to the clipboard or returned to the application as plain text." (from the wxWidgets Programming pdf)