Open at the source.

As the first major computer company to make Open Source development a key part of its ongoing software strategy, Apple remains committed to the Open Source development model. Major components of Mac OS X, including the UNIX core, are made available under Apple’s Open Source license, allowing developers and students to view source code, learn from it and submit suggestions and modifications. In addition, Apple uses software created by the Open Source community, such as the HTML rendering engine for Safari, and returns its enhancements to the community.

Apple believes that using Open Source methodology makes Mac OS X a more robust, secure operating system, as its core components have been subjected to the crucible of peer review for decades. Any problems found with this software can be immediately identified and fixed by Apple and the Open Source community.

If you’re a developer, we invite you to inspect Mac OS X under the hood, free of charge, by joining the Darwin development process or just see a sampling of the Open Source projects used and created by Apple.

Open Source Projects:

ComponentProjectVersionUsed In
AddressBookMetakit2.4.9.2Mac OS X, Xcode Tools
AirPortFamilywpa_supplicant0.3.9Mac OS X
AKCmdsLibTIFF3.8.2Mac OS X, Xcode Tools
amavisdamavisd-newamavisd-new-2.5.1Mac OS X
apacheapache2.2.11Mac OS X, Xcode Tools
apache_mod_fastcgimod_fastcgi2.4.2Mac OS X
apache_mod_perlmod_perl2.0.4Mac OS X, Xcode Tools
apache_mod_phpphp5.3.0Mac OS X, Xcode Tools
" "libpng1.2.37-
" "libjpeg6b-
apache_mod_scgi_pubsubmod_scgi_pubsub1.11-pubsubMac OS X
Apple_Gutenprint_PrinterSupportgutenprint5.2.3Mac OS X, Printing
AppleShareClientLibopenssl0.9.1cMac OS X, Xcode Tools
aprapr1.3.5Mac OS X, Xcode Tools
" "apr-util1.3.7-
autoconfautoconf2.61Xcode Tools
automakeautomake1.10Xcode Tools
awkawkOctober 23, 2007Mac OS X
AxisAxis1.4Server
bashbash3.2Mac OS X
bcbc1.06Mac OS X
BerkeleyDBBerkeleyDB4.6.21Mac OS X, Server
bind9bind99.6.0-P1Mac OS X
bisonbison2.3Xcode Tools
bsdiffbsdiff4.3Mac OS X
bsdmakebsdmake2006-04-12Xcode Tools
" "bsdmake-mk2005-10-18-
bzip2bzip21.0.5Mac OS X, Xcode Tools
cctoolsgas1.38.1Mac OS X, Xcode Tools
ChatServergettext0.16.1Server
" "glib2.16.6-
" "Jabber2.1.24.1-
" "libidn0.6.14-
" "mu-conference0.8.0-
" "Proxy651.1.1-
Chesssjeng11.2Mac OS X
clamavclamavclamav 0.95.2 Server
clangclang090120Xcode Tools
" "llvm090120-
CommonCryptoopensslopenssl-0.9.6Mac OS X, Xcode Tools
" "Gladman AESaes-src-26-08-05-
" "Gladman SHA2sha-26-08-05-
croncron2007-02-15Mac OS X
cupsCUPS1.4.0 (r8750)Mac OS X
curlcurl7.19.4Mac OS X, Xcode Tools
cvscvs1.12.13Xcode Tools
cxxfiltbinutils070207Mac OS X
CyrusIMAPCyrus IMAP Servercyrus_imap_2.3.8Server
DataDetectorsCoreInternational Components for Unicode3.6Mac OS X
diffstatdiffstat1.41Mac OS X
distccdistcc2.18.5Xcode Tools
doc_cmdschecknr2004-09-18Mac OS X
" "colcrt2004-09-18-
" "getNAME2004-09-18-
" "makewhatis2004-09-18-
dovecotdovecotReleased v1.1.17Server
DSPasswordServerFrameworkOpenSSH3.8.1p1Mac OS X
dtraceDTraceon-src-20060828Mac OS X, Xcode Tools
efaxefax0.9a-001114Mac OS X
emacsEmacs22.1Mac OS X
enscriptenscript1.6.4Mac OS X
expatexpat2.0.1Mac OS X, Xcode Tools
FastCGIfcgi2.4.0Mac OS X, Xcode Tools
" "ruby-fcgi0.8.7-
fetchmailfetchmail6.3.8Mac OS X
filefile5.00Mac OS X
FileSynclookup3n/aMac OS X
flexflex2.5.35Xcode Tools
freeradiusfreeradius2.1.3Server, Xcode Tools
FTPServerwu-ftpd2.4.2b17Server
gdbgdb6.3.50-20050815Xcode Tools
glibtoolglibtool2.2.4Mac OS X, Xcode Tools
gm4m41.4.6Xcode Tools
gnudiffdiffutils2.8.1Mac OS X
gnumakemake3.81Xcode Tools
gnuservgnuserv3.12.4Mac OS X
gnutartar1.17Mac OS X
gnuzipgzip1.3.12Mac OS X
gperfgperf3.0.3Xcode Tools
gptgptRELENG_6_2_0_RELEASEMac OS X
grepgrep2.5.1Mac OS X
groffgroff1.19.2Mac OS X
hunspellhunspell1.2.8Mac OS X
" "sjp.pl20080831-
ICUInternational Components for Unicode4.0Mac OS X
ImageIOgiflibgiflib-4.1.6Mac OS X, Xcode Tools
" "libJP2libJP2-5.1-
" "libjpeglibjpeg-6b-
" "libOpenEXR-1.4.0a-
" "libRadiance-
" "libtifflibTIFF-3.8.2-
InternetServicesSupportexpat1.95.5Mac OS X
iodbciodbc3.52.6Mac OS X, Xcode Tools
ipsecracoon0.6.7Mac OS X
" "libipsec0.6.5-
" "setkey0.6.5-
" "racoonctl0.6.5-
JavaToolsAnt1.7Mac OS X, Xcode Tools
" "JUnit4.1-
" "Maven2.0.5-
" "Derby10.4.2.0-
KerberosLibrariesKerberosKfM-6.5fc1Mac OS X, Xcode Tools
kshksh2007-11-05Mac OS X
" "ksh2007-11-05-
lessless418Mac OS X
libarchivelibarchive2.6.2Mac OS X
Libcpp_kextGCC4.2.1Xcode Tools
libeditlibedit2.11Mac OS X, Xcode Tools
libeventlibevent1.4.4Mac OS X
libiconvlibiconv1.11Mac OS X, Xcode Tools
libpcaplibpcap1.0.0Mac OS X, Xcode Tools
libstdcxxgcc4.2.1Mac OS X, Xcode Tools
libstdcxx_40gcc4.0.0Xcode Tools
libutillibutil2005-02-13Mac OS X
" "libutil1.3-
libxml2libxml22.7.3Mac OS X, Xcode Tools
libxsltlibxslt1.1.24Mac OS X, Xcode Tools
lsoflsof4.82Mac OS X
lukemftplukemftp20070806Mac OS X
lukemftpdtnftpd20080929Mac OS X
mailmanmailmanmailman 2.1.12rc1Server
manman1.6cMac OS X
MeCabMeCab0.95Mac OS X, Xcode Tools
memcachedmemcached1.2.8Mac OS X
MeshKitFCollada3.05BMac OS X
MySQLMySQL5.0.82Server
nanonano2.0.6Mac OS X
nasmnasm0.98.40Xcode Tools
ncursesncurses5.5Mac OS X, Xcode Tools
neonneon0.28.3Mac OS X
net_snmpnet-snmp5.4.1Mac OS X, Xcode Tools
netcatncHEADMac OS X
NotificationServeridavoll0.7.3Mac OS X
" "wokkel0.3.1-
ntpntp4.2.4p4Mac OS X
OpenALOpenAL1.1Mac OS X, Xcode Tools
OpenBSMopenbsm1.1Mac OS X, Xcode Tools
OpenLDAPOpenLDAP2.4.11Mac OS X
" "NetBSD-
" "NetBSD-
openmpiopenmpi1.2.8Mac OS X, Xcode Tools
OpenPAMOpenPAM20071221Mac OS X, Xcode Tools
OpenSSHOpenSSH5.2p1Mac OS X
OpenSSL096OpenSSL0960.9.6lMac OS X
OpenSSL097OpenSSL0.9.7lMac OS X
OpenSSL098OpenSSL0.9.8jMac OS X, Xcode Tools
passwordserver_saslpasswordserver_sasl2.1.22Mac OS X
patch_cmdspatch2.5.8Mac OS X
pcrepcre7.8Mac OS X
perlperl5.10.0Mac OS X, Xcode Tools
" "perl5.8.9-
PodcastProducerClientCFrameworks3.0.5Mac OS X
portmapportmap2001-04-25Mac OS X
postfixPostfixpostfix-2.4.3Mac OS X, Server
procmailprocmail3.22Mac OS X
pyobjcpyobjctrunk-20090623Mac OS X, Xcode Tools
pyOpenSSLpyOpenSSL0.7Mac OS X
PyRSS2GenPyRSS2Gen1.0.0Mac OS X
pythonpython2.6Mac OS X, Xcode Tools
" "python2.5.4-
python_dateutilpython_dateutil1.2Mac OS X
python_modulesaltgraph0.6.8Mac OS X, Xcode Tools
" "bdist_mpkg0.4.3-
" "bonjour-py0.3-
" "macholib1.2.1.dev-r432-
" "modulegraph0.7.2.dev-r439-
" "numpy1.2.1-
" "py2app0.4.2-
" "setuptools0.6c9-
" "xattr0.5-
Quartz2DLibTIFF3.8.2Mac OS X, Xcode Tools
rcsrcs5.7Xcode Tools
RemoteDesktopkeysymdef.h1.4Mac OS X
" "Brian Gladman's Rijndael Implementation1.0-
" "AGRegex0.3-
" "VNC Reflector1.2.4-
" "MAPKIT1.4-
" "PCRE4.0-
" "JPEG Library6b-
removefilesrm1.2.8Mac OS X, Xcode Tools
rsyncrsync2.6.9Mac OS X
rubyruby1.8.7-p72Mac OS X, Xcode Tools
ruby_dnssdruby_dnssd0.6.0Mac OS X
ruby_libxmllibxml-ruby1.1.2Mac OS X
RubyCocoaRubyCocoa0.13.1Mac OS X, Xcode Tools
" "RubyNode0.1.3-
RubyGemsRubyGems1.3.1Mac OS X
RubyOnRailsacts_as_ferret0.4.3Mac OS X
" "capistrano2.5.2-
" "cgi_multipart_eof_fix2.5.0-
" "daemons1.0.10-
" "fastthread1.0.1-
" "ferret0.11.6-
" "gem_plugin0.2.3-
" "highline1.5.0-
" "hpricot0.6.164-
" "mongrel1.1.5-
" "needle1.3.0-
" "net-scp1.0.1-
" "net-sftp1.1.1-
" "net-sftp2.0.1-
" "net-ssh1.1.4-
" "net-ssh2.0.4-
" "net-ssh-gateway1.0.0-
" "rake0.8.3-
" "RedCloth4.1.1-
" "ruby-openid2.1.2-
" "ruby-yadis0.3.4-
" "sqlite3-ruby1.2.4-
" "termios0.9.4-
" "xmpp4r0.4-
" "actionmailer1.3.6-
" "actionpack1.13.6-
" "actionwebservice1.2.6-
" "activerecord1.15.6-
" "activesupport1.4.4-
" "rails1.2.6-
" "actionmailer2.2.2-
" "actionpack2.2.2-
" "activerecord2.2.2-
" "activeresource2.2.2-
" "activesupport2.2.2-
" "rails2.2.2-
sambasamba3.0.28aMac OS X
Sandboxtinyscheme1.38Mac OS X
screenscreen4.0.3Mac OS X
ScreenSharingkeysymdef.h1.4Mac OS X
" "Brian Gladman's Rijndael Implementation1.0-
" "VNC Reflector1.2.4-
" "JPEG Library6b-
SmartcardCCIDccid1.3.8Mac OS X
smbsmbfs1.3.6Mac OS X
" "mlrpconnv_89-
SpamAssassinSpamAssassinSpamAssassin-3.2.1Server, Xcode Tools
SpotlightSQLite3.1.3Mac OS X, Xcode Tools
SQLiteSQLite3.6.12Mac OS X, Xcode Tools
SquirrelMailSquirrelMail1.4.17Server
srmsrm1.2.8Mac OS X
subversionsubversion1.6.2Mac OS X, Xcode Tools
sudosudo1.7.0Mac OS X
svkSVKv2.2.1Xcode Tools
" "SVN-Dump0.04-
" "SVN-Mirror0.75-
" "SVN-Simple0.27-
swigswig1.3.31Mac OS X, Xcode Tools
tcltcl8.5.7Mac OS X, Xcode Tools
" "tk8.5.7-
" "tcl848.4.19-
" "tk848.4.19-
" "bwidget1.8.0-
" "expect5.44.1.11-
" "ffidl0.6.1-
" "incrtcl3.4-
" "iwidgets4.0.2-
" "memchan2.2.1-
" "mk4tcl2.4.9.7-
" "tbcload1.7-
" "tcllib1.11.1-
" "tclsoap1.6.7-
" "tclvfs1.4-
" "tclx8.4-
" "tclxml2.6-
" "tcldom2.6-
" "tclxslt2.6-
" "tdom0.8.3-
" "thread2.6.5-
" "tkcon2.5-
" "tkimg1.4-
" "tklib0.4.1.0-
" "tktable2.10-
" "tktreectrl2.2.8-
" "tls1.6-
" "trf2.1.3-
" "xotcl1.6.2-
" "quicktimetcl3.2-
" "snack2.2.10-
" "tclresource1.1.2-
" "tclae2.0.3-
" "tclapplescript1.0-
tcp_wrapperstcp_wrappers7.6-ipv6.4Mac OS X, Xcode Tools
tcpdumptcpdump4.0.0Mac OS X
tcshtcsh6.15.00Mac OS X
texi2htmltexi2html1.70Mac OS X
texinfotexinfo4.8Mac OS X
text_cmdsbanner2005-09-16Mac OS X
" "cat2005-09-16-
" "cksum2005-09-16-
" "col2005-09-16-
" "colrm2005-09-16-
" "column2006-09-19-
" "comm2005-09-16-
" "csplit2005-09-16-
" "cut2005-09-16-
" "ed2005-09-16-
" "expand2005-09-16-
" "fmt2005-09-16-
" "fold2005-09-16-
" "head2005-09-16-
" "join2005-09-16-
" "lam2005-09-16-
" "look2005-09-16-
" "md52005-09-16-
" "nl2005-09-16-
" "paste2005-09-16-
" "pr2005-09-16-
" "rev2005-09-16-
" "rs2005-09-16-
" "sed2005-09-16-
" "coreutils/sortcoreutils-5.93-
" "split2005-09-16-
" "tail2005-09-16-
" "tr2005-09-16-
" "ul2005-09-16-
" "unexpand2005-09-16-
" "uniq2005-09-16-
" "unvis2005-09-16-
" "vis2005-09-16-
" "wc2005-09-16-
tidytidy2006.11.1Mac OS X, Xcode Tools
TomcatTomcat6.0.18Server
TwistedTwisted8.2.0Mac OS X, Xcode Tools
uucpuucp1.07Mac OS X
vimvim7.2.108Mac OS X
" "vim7.2-
WebServerAdditionsmod_bw0.8Server
" "mod_encoding220021209-
" "mod_jk1.2.28-
" "mod_python3.3.1-
" "mod_xsendfile0.9-
WikiServerelementtree1.2.6-20050316Server
" "zanshin0.6b1-
" "bonjour-py0.2-
WikiServerUIprototype1.5.0_rc0Server
" "script.aculo.us1.6.4-
" "xmlrpc.js1.0b1-
wokkelwokkel0.3.1Mac OS X
wxWidgetswxWidgets2.8Mac OS X, Xcode Tools
X11appsappres1.0.1X11
" "bdftopcf1.0.1-
" "bitmap1.0.3-
" "editres1.0.3-
" "fonttosfnt1.0.4-
" "fslsfonts1.0.2-
" "fstobdf1.0.3-
" "iceauth1.0.2-
" "ico1.0.2-
" "listres1.0.1-
" "luit1.0.3-
" "mkfontdir1.0.4-
" "mkfontscale1.0.6-
" "oclock1.0.1-
" "rgb1.0.3-
" "sessreg1.0.4-
" "showfont1.0.2-
" "setxkbmap1.0.4-
" "twm1.0.4-
" "viewres1.0.1-
" "x11perf1.5-
" "xauth1.0.3-
" "xbitmaps1.0.1-
" "xcalc1.0.2-
" "xclipboard1.0.1-
" "xclock1.0.3-
" "xconsole1.0.3-
" "xcursorgen1.0.2-
" "xditview1.0.1-
" "xdm1.1.8-
" "xdpyinfo1.0.3-
" "xedit1.1.2-
" "xev1.0.3-
" "xeyes1.0.1-
" "xfd1.0.1-
" "xfontsel1.0.2-
" "xfs1.0.8-
" "xfsinfo1.0.2-
" "xgc1.0.1-
" "xhost1.0.2-
" "xinput1.4.1-
" "xkbcomp1.0.5-
" "xkeyboard-config1.3-
" "xkbevd1.0.2-
" "xkbprint1.0.1-
" "xkbutils1.0.1-
" "xkill1.0.1-
" "xload1.0.2-
" "xlogo1.0.1-
" "xlsatoms1.0.1-
" "xlsclients1.0.1-
" "xlsfonts1.0.2-
" "xmag1.0.2-
" "xman1.0.3-
" "xmessage1.0.2-
" "xmh1.0.1-
" "xmodmap1.0.3-
" "xmore1.0.1-
" "xpr1.0.2-
" "xprop1.0.4-
" "xrandr1.3.0-
" "xrdb1.0.5-
" "xrefresh1.0.2-
" "xrx1.0.2-
" "xset1.0.4-
" "xsetmode1.0.0-
" "xsetpointer1.0.1-
" "xsetroot1.0.2-
" "xsm1.0.1-
" "xstdcmap1.0.1-
" "xterm243-
" "xtrap1.0.2-
" "xvinfo1.0.1-
" "xwd1.0.2-
" "xwininfo1.0.4-
" "xwud1.0.1-
X11fonts-encodings1.0.0X11
" "font-adobe-100dpi1.0.0-
" "font-adobe-75dpi1.0.0-
" "font-adobe-utopia-100dpi1.0.1-
" "font-adobe-utopia-75dpi1.0.1-
" "font-adobe-utopia-type11.0.1-
" "font-alias1.0.1-
" "font-arabic-misc1.0.0-
" "font-bh-100dpi1.0.0-
" "font-bh-75dpi1.0.0-
" "font-bh-lucidatypewriter-100dpi1.0.0-
" "font-bh-lucidatypewriter-75dpi1.0.0-
" "font-bh-ttf1.0.0-
" "font-bh-type11.0.0-
" "font-bitstream-100dpi1.0.0-
" "font-bitstream-75dpi1.0.0-
" "font-bitstream-speedo1.0.0-
" "font-bitstream-type11.0.0-
" "font-cronyx-cyrillic1.0.0-
" "font-cursor-misc1.0.0-
" "font-daewoo-misc1.0.0-
" "font-dec-misc1.0.0-
" "font-ibm-type11.0.0-
" "font-isas-misc1.0.0-
" "1.0.0-
" "font- 1.0.0-
" "font- 1.0.0-
" "font-misc-ethiopic1.0.0-
" "font-misc-meltho1.0.0-
" "font-misc-misc1.0.0-
" "font-mutt-misc1.0.0-
" "font-schumacher-misc1.0.0-
" "font-screen-cyrillic1.0.0-
" "font-sony-misc1.0.0-
" "font-sun-misc1.0.0-
" "font-util1.0.1-
" "font-winitzki-cyrillic1.0.0-
" "font-xfree86-type11.0.1-
" "ttf-bitstream-vera1.10-
X11libscairo1.8.6X11
" "libAppleWM1.3.0-
" "libdmx1.0.2-
" "libfontenc1.0.4-
" "libFS1.0.1-
" "libICE1.0.5-
" "liblbxutil1.0.1-
" "liboldX1.0.1-
" "libpng1.2.35-
" "libSM1.1.0-
" "libX111.2.1-
" "libXau1.0.4-
" "libXaw1.0.4-
" "libXaw1.0.5-
" "libXcomposite0.4-
" "libXcursor1.1.9-
" "libXdamage1.1.1-
" "libXdmcp1.0.2-
" "libXevie1.0.2-
" "libXext1.0.5-
" "libXfixes4.0.3-
" "libXfont1.4.0-
" "libXfontcache1.0.4-
" "libXft2.1.13-
" "libXi1.2.1-
" "libXinerama1.0.3-
" "libxcb1.2-
" "libxkbfile1.0.5-
" "libxkbui1.0.2-
" "libXmu1.0.4-
" "libXp1.0.0-
" "libXpm3.5.7-
" "libXprintAppUtil1.0.1-
" "libXprintUtil1.0.1-
" "libXrandr1.3.0-
" "libXrender0.9.4-
" "libXres1.0.3-
" "libXScrnSaver1.1.2-
" "libXt1.0.5-
" "libXTrap1.0.0-
" "libXtst1.0.3-
" "libXv1.0.4-
" "libXvMC1.0.4-
" "libXxf86dga1.0.2-
" "libXxf86misc1.0.1-
" "libXxf86vm1.0.2-
" "pixman0.14.0-
" "xcb-util0.3.3-
" "xpyb1.1-
" "xtrans1.2.3-
X11miscgccmakedep1.0.2X11
" "lndirgit-2007.12.06-
" "makedepend1.0.1-
" "xorg-docs1.4-
" "xorg-sgml-doctools1.1-
X11protoxcb-proto1.4Mac OS X, X11
" "fontconfig2.6.0-
" "freetype2.3.9-
" "pkg-config0.23-
" "applewmproto1.3.0-
" "bigreqsproto1.0.2-
" "compositeproto0.4-
" "damageproto1.1.0-
" "dmxproto2.2.2-
" "dri2proto1.99.3-
" "evieext1.0.2-
" "fixesproto4.0-
" "fontcacheproto0.1.2-
" "fontsproto2.0.2-
" "glproto1.4.9-
" "inputproto1.5.0-
" "kbproto1.0.3-
" "printproto1.0.4-
" "randrproto1.3.0-
" "recordproto1.13.2-
" "renderproto0.9.3-
" "resourceproto1.0.2-
" "scrnsaverproto1.1.0-
" "trapproto3.4.3-
" "util-macros1.2.1-
" "videoproto2.2.2-
" "xcmiscproto1.1.2-
" "xextproto7.0.5-
" "xf86bigfontproto1.1.2-
" "xf86dgaproto2.0.3-
" "xf86driproto2.0.4-
" "xf86miscproto0.9.2-
" "xf86rushproto1.1.2-
" "xf86vidmodeproto2.2.2-
" "xineramaproto1.1.2-
" "xproto7.0.15-
" "xproxymanagementprotocol1.0.2-
X11serverMesaLib7.0.4Mac OS X, X11
" "MesaLib7.2-
" "MesaDemos7.2-
" "MesaGLUT7.2-
" "AppleSGLX57-
" "xorg-server1.4.2-apple45-
" "xorg-server1.6.0-
" "xinit1.1.1-
xarxar1.4Mac OS X, Xcode Tools
zipzip3.0Mac OS X
" "unzip5.52-
zlibzlib1.2.3Mac OS X, Xcode Tools
ZopeInterfaceZope3.5.1Mac OS X
zshzsh4.3.9Mac OS X