Thunderbird is a total redesign of the Mozilla mail component to produce a cross-platform, stand-alone mail application using the XUL user interface language. It has many new features, among them the ability to customize your toolbars the way you want them. a new look and feel with a large number of downloadable themes which alter the appearance of the client, and the ability to add UI extensions.
COMPILIBRE allows you to easily build your own software and documentation compilations for Windows and Mac OS X. Compilations are ready to be stored onto a digital medium (such as CD, DVD, or USB key) or to be broadcast over the Internet. It has a Web-based interface in which you store the description of several software packages. Then, you choose which software packages you want to put into the compilation, and COMPILIBRE produces an ISO file, a zip file, and a BitTorrent file that contains the software, their descriptions, their documentation, and a multi-installer program.