Wow. Of all these "must-have" apps for Linux, four are proprietary, almost all are specialized, and only one (Thunderbird) is something I actually use on a dai

Wow. Of all these "must-have" apps for Linux, four are proprietary, almost all are specialized, and only one (Thunderbird) is something I actually use on a daily basis (even that one isn't a "must have", as plenty of people have had great success using claws-mail, kmail, mutt, pine, gmail, or other equally good mail readers). Two of the proprietary ones even have worthwhile open-source alternatives! xpdf and Okular are both quite suitable as Adobe Reader replacements, and Marble, while lacking many of the cool features of Google Earth, is just as much fun for pretending to be learning geography while relaxing. This list adds little if any value to the community and fails to perform its stated purpose.