Brasero is a application to burn CD/DVD for the Gnome Desktop. (GPL)
Linux - FreeBSD
A small burning application for Windows. cdrtfe is a frontend for the cdrtools, Mode2CDMaker and VCDImager. (GPL)
Windows
InfraRecorder is a free CD/DVD burning solution for Microsoft Windows. (GPL)
Windows
K3b is a CD and DVD authoring application for the KDE desktop for Unix-like computer operating systems. (GPL)
Linux - FreeBSD