A cross-platform GUI library
wxWidgets is a C++ library that lets developers create applications for Windows, Mac OS X, Linux and other platforms with a single code base. It has popular language bindings for Python, Perl, Ruby and many other languages, and unlike other cross-platform toolkits, wxWidgets gives applications a truly native look and feel because it uses the platform's native API rather than emulating the GUI. It's also extensive, free, open-source and mature.
Building a secure browser for classic Mac OS
This is the download repository for Classilla, the Mozilla-based browser for Mac OS 9 (and 8.6). No tickets are accepted here; this is just for files. For our web page, see http://www.classilla.org/