Openbox is a good option for Linux. It's a floating window manager that has minimal build requirements and is configured via text files, though GUI configuratio

Openbox is a good option for Linux. It's a floating window manager that has minimal build requirements and is configured via text files, though GUI configuration tools exist for those so inclined. Its menu system supports pipe menus, and you can make it look like nearly anything you want. The Lumina desktop is another contender; it's a project by the TrueOS/PC-BSD folks and it's coming along nicely. It also has minimal requirements and while it's made for BSD it also works well on Linux.