I missed that the Gnash team had started a blog, but in going through my feeds I discovered it and found out that they’ve recently added support for viewing YouTube videos. Gnash is an open source project that aims to provide the functionality of the Flash Player. It has had some decent success and has become a fairly trendy project in the open source world.

Gnash has been focused on implementing features

from Flash Player 7 and being able to play YouTube videos is a substantial milestone. There were a lot of changes from Flash Player 7 to Flash Player 9, and with the release of the Linux version of the player, the need to download Gnash may be lessened, but it does provide a lot of Flash Player 7 functionality for those who want a true open source solution.

ZDNet Blog