Ratpoison is a project mainly written in C and PERL, based on the GPL-2.0 license.
my ratpoison sources
Copyright (C) 2000, 2001, 2002, 2003, 2004 Shawn Betts
Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.
ratpoison is a simple Window Manager with no fat library dependencies, no fancy graphics, no window decorations, and no flashy wank. It is largely modelled after GNU Screen which has done wonders in virtual terminal market.
All interaction with the window manager is done through keystrokes. ratpoison has a prefix map to minimize the key clobbering that cripples EMACS and other quality pieces of software.
ratpoison uses autoconf. To build it:
$ ./configure && make
if you want to install it, simply type 'make install' as a privileged user:
Use the configure option '--enable-debug' to enable debugging symbols.
Use the configure option '--disable-history' to disable the filesystem rat.
Use the configure option '--with-xterm=PROG' to set the x terminal emulator to use. The default is `xterm'.
Consult the INSTALL file for more information about the configure script.
See the info manual for more information.