Feather Linux, created by Robert Sullivan, is a Knoppix-based operating system which fits in under 128 MB (while older versions were made to fit within 64 MB). It boots from either a CD or a USB Flash Drive, into a Fluxbox desktop environment. It has a wide range of desktop and rescue software, and can load entirely into RAM (if enough RAM is available) or be installed to a hard drive. Feather Linux contains GTK+ applications, such as AbiWord and Pidgin. Feather Linux has tried to include software that people would frequently be using on their desktop.

With its most recent release being on July 4, 2005, Feather Linux is now dormant.