This is the Debian GNU/Linux package sensible-utils.

It is an original Debian package, was maintained by
Clint Adams <schizo@debian.org>.  It is now maintained by
Anibal Monsalve Salazar <anibal@debian.org>.

All its programs (sensible-editor, sensible-pager, and sensible-browser)
may be redistributed under the terms of the GNU GPL, Version 2 or later,
found on Debian systems in the file /usr/share/common-licenses/GPL-2.

sensible-editor is
Copyright © 1997  Guy Maor
Copyright © 2002, 2004, 2006  Clint Adams

sensible-pager is
Copyright © 1997, 1998  Guy Maor
Copyright © 2004  Clint Adams

sensible-browser is
Copyright © 2002  Joey Hess
Copyright © 2003, 2007, 2008  Clint Adams