FreeBSD Source:

This is the top level of the FreeBSD source directory.

FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms. A large community has continually developed it for more than thirty years. Its advanced networking, security, and storage features have made FreeBSD the platform of choice for many of the busiest web sites and most pervasive embedded networking and storage devices.

For copyright information, please see the file COPYRIGHT in this directory. Additional copyright information also exists for some sources in this tree - please see the specific source directories for more information.

The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7), config(8), FreeBSD handbook on building userland, and Handbook for kernels for more information, including setting make(1) variables.

For information on the CPU architectures and platforms supported by FreeBSD, see the FreeBSD website's Platforms page.

For official FreeBSD bootable images, see the release page.

Source Roadmap:

Directory	Description
bin	System/user commands.
cddl	Source code for third-party software under the Common Development and Distribution License.
contrib	Source code for third-party software.
crypto	Source code for cryptographic libraries and commands (see crypto/README).
etc	Template files for /etc.
gnu	Source code for third-party software under the GNU General Public License (GPL) or Lesser General Public License (LGPL). Please see gnu/COPYING and gnu/COPYING.LIB for more information.
include	System include files.
kerberos5	Build system for Kerberos 5 (Heimdal).
krb5	Build system for Kerberos 5 (MIT).
lib	System libraries.
libexec	System commands intended to be executed by other commands or daemons.
release	Makefiles and scripts used for building releases and VM images.
rescue	Build system for statically linked /rescue commands.
sbin	System commands.
secure	Build system for cryptographic libraries and commands (excluding Kerberos).
share	Shared resources.
stand	Boot loader sources.
sys	Kernel sources (see sys/README.md).
targets	Support for experimental DIRDEPS_BUILD
tests	Tests which can be run by Kyua. See tests/README for additional information.
tools	Ancillary utilities and tests (not included in the build).
usr.bin	User commands.
usr.sbin	System administration commands.

For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see FreeBSD Handbook.