GNU Cppi indents C preprocessor directives to reflect their nesting, among other regularizations.
Cppi can be found on the main GNU ftp server: http://ftp.gnu.org/gnu/cppi/ (via HTTP) and ftp://ftp.gnu.org/gnu/cppi/ (via FTP). It can also be found on the GNU mirrors; please use a mirror if possible.
Documentation for Cppi is available online, as is documentation for most GNU software. You may also find more information about Cppi by running info cppi or man cppi, or by looking at /usr/doc/cppi/, /usr/local/doc/cppi/, or similar directories on your system. A brief summary is available by running cppi --help.
Cppi has one mailing list: <firstname.lastname@example.org>.
This list is used to discuss all aspects of Cppi, including general discussion, user help, and enhancement requests, as well as bug reports.
Announcements about Cppi and most other GNU software are made on <email@example.com>.
To subscribe to these or any GNU mailing lists, please send an empty mail with a Subject: header of just subscribe to the relevant -request list. For example, to subscribe yourself to the GNU announcement list, you would send mail to <firstname.lastname@example.org>. Or you can use the mailing list web interface.
Development of Cppi, and GNU in general, is a volunteer effort, and you can contribute. For information, please read How to help GNU. If you'd like to get involved, it's a good idea to join the discussion mailing list (see above).
Cppi is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.
The Free Software Foundation is the principal organizational sponsor of the GNU Operating System. Support GNU and the FSF by buying manuals and gear, joining the FSF as an associate member, or making a donation, either directly to the FSF or via Flattr.