butchers-paper is a dinky little python program that acts just like butchers paper and a crayon.
butchers-paper is free software, licensed under the GNU GPL.
The latest version of the source code is kept in arch:
baz register-archive http://arch.spacepants.org/jaq@spacepants.org--2004
baz get jaq@spacepants.org--2004/mindmap--main--0
see here for details.