====== BSD Systems Family Tree ======
http://cvsweb.freebsd.org/src/share/misc/bsd-family-tree

  The UNIX system family tree: Research and BSD
  ---------------------------------------------
  First Edition (V1)
       |
  Second Edition (V2)
       |
  Third Edition (V3)
       |
  Fourth Edition (V4)
       |
  Fifth Edition (V5)
       |
  Sixth Edition (V6) -----*
         \                |
          \               |
           \              |
  Seventh Edition (V7)    |
              \           |
               \        1BSD
               32V        |
                 \      2BSD---------------*
                  \    /                   |
                   \  /                    |
                    \/                     |
                   3BSD                    |
                    |                      |
                 4.0BSD                2.79BSD
                    |                      |
                 4.1BSD --------------> 2.8BSD
                    |                      |
                4.1aBSD -----------\       |
                    |                \     |
                4.1bBSD                \   |
                    |                    \ |
        *------ 4.1cBSD --------------> 2.9BSD
       /            |                      |
  Eighth Edition    |                   2.9BSD-Seismo
       |            |                      |
       +----<--- 4.2BSD               2.9.1BSD
       |            |                      |
       +----<--- 4.3BSD -------------> 2.10BSD
       |            |               /      |
  Ninth Edition     |              / 2.10.1BSD
       |         4.3BSD Tahoe-----+        |
       |            |              \       |
       |            |                \     |
       v            |                  2.11BSD
  Tenth Edition     |                      |
                    |                  2.11BSD rev #430
                 4.3BSD NET/1              |
                    |                      v
                 4.3BSD Reno
                    |
     *---------- 4.3BSD NET/2 -------------------+-------------*
     |                    |                      |             |
  386BSD 0.0              |                      |           BSD/386 ALPHA
     |                    |                      |             |
  386BSD 0.1 ------------>+                      |           BSD/386 0.3.[13]
     |     \              |                  4.4BSD Alpha      |
     |     386BSD 1.0     |                      |           BSD/386 0.9.[34]
     |                    |                  4.4BSD            |
     |                    |                    / |             |
     |                    |   4.4BSD-Encumbered  |             |
     |                 NetBSD 0.8                |           BSD/386 1.0
     |                    |                      |             |
  FreeBSD 1.0          NetBSD 0.9                |           BSD/386 1.1
     |                    |           .----- 4.4BSD Lite       |
  FreeBSD 1.1             |          /   /       |     \       |
     |                    |         /   /        |      \      |
  FreeBSD 1.1.5       .---|--------'   /         |       \     |
     |               /    |           /          |        \    |
  FreeBSD 1.1.5.1   /     |          /           |         \   |
     |             /   NetBSD 1.0 <-'            |          \  |
     |            /       |                      |           \ |
  FreeBSD 2.0 <--'        |                      |           BSD/OS 2.0
     |                     \                     |             |
  FreeBSD 2.0.5             \                    |           BSD/OS 2.0.1
     |                 .-----\------------- 4.4BSD Lite2       |
     |                 |      \             |  |   |   |       |
     |                 | .-----|------Rhapsody |   |   |       |
     |                 | |     |        NetBSD 1.3 |   |       |
     |                 | |     |           OpenBSD 2.3 |       |
     |                 | |     |                BSD/OS 3.0     |
  FreeBSD 2.1          | |     |                               |
   |   |               | |  NetBSD 1.1 ------.               BSD/OS 2.1
   | FreeBSD 2.1.5     | |     |              \                |
   |     |             | |  NetBSD 1.2         \             BSD/OS 3.0
   | FreeBSD 2.1.6     | |     |  \          OpenBSD 2.0       |
   |     |             | |     |   \             |             |
   | FreeBSD 2.1.6.1   | |     |    \            |             |
   |     |             | |     |     \           |             |
   | FreeBSD 2.1.7     | |     |      |          |             |
   |     |             | |     |  NetBSD 1.2.1   |             |
   | FreeBSD 2.1.7.1   | |     |                 |             |
   |                   | |     |                 |             |
   |                   | |     |                 |             |
   *-FreeBSD 2.2       | |     |                 |             |
   |        \          | |     |                 |             |
   |     FreeBSD 2.2.1 | |     |                 |             |
   |         |         | |     |                 |             |
   |     FreeBSD 2.2.2 | |     |             OpenBSD 2.1       |
   |         |         | |     |                 |             |
   |     FreeBSD 2.2.5 | |     |                 |             |
   |         |         | |     |             OpenBSD 2.2       |
   |         |         | |  NetBSD 1.3           |             |
   |     FreeBSD 2.2.6 | |     |    |            |             |
   |         |         | |     | NetBSD 1.3.1    |           BSD/OS 3.1
   |         |         | |     |    |        OpenBSD 2.3       |
   |         |         | |     | NetBSD 1.3.2    |             |
   |     FreeBSD 2.2.7 | |     |    |            |             |
   |         |         | |     |    |            |           BSD/OS 4.0
   |         v         | |     |    |            |             |
   |     FreeBSD 2.2.8 | |     |    |            |             |
   |                   | |     |    |        OpenBSD 2.4       |
  FreeBSD 3.0 <--------* |     |    v            |             |
   |                     |     | NetBSD 1.3.3    |             |
   *---FreeBSD 3.1       |     |                 |             |
   |       |             |     |                 |           BSD/OS 4.0.1
   |   FreeBSD 3.2----*  |  NetBSD 1.4       OpenBSD 2.5       |
   |       |          |  |  |  |    |            |             |
   |       |          |  |  |  |    |            |             |
   |       |          |  |  |  |    |            |             |
   |   FreeBSD 3.3    |  |  |  | NetBSD 1.4.1    |             |
   |       |          |  |  |  |    |        OpenBSD 2.6       |
   |   FreeBSD 3.4    |  |  |  |    |            |             |
   |           |      |  |  |  |    |            |           BSD/OS 4.1
  FreeBSD 4.0  |      |  |  |  | NetBSD 1.4.2    |             |
   |           |      |  |  |  |    |            |             |
   |           |      |  |  |  |    |            |             |
   |   FreeBSD 3.5    |  |  |  |    |        OpenBSD 2.7       |
   |           |      |  |  |  |    |            |             |
   |   FreeBSD 3.5.1  |  |  |  |    |            |             |
   |                  |  |  |  |    |            |             |
   *---FreeBSD 4.1    |  |  |  |    |            |             |
   |      |           |  | (?) |    |            |             |
   |   FreeBSD 4.1.1  |  |  /  |    |            |             |
   |      |           |  | /   |    |            |             |
   |   FreeBSD 4.2   Darwin/   | NetBSD 1.4.3    |             |
   |      |         Mac OS X   |             OpenBSD 2.8     BSD/OS 4.2
   |      |             |      |                 |             |
   |      |             |      |                 |             |
   |      |           10.0  NetBSD 1.5           |             |
   |   FreeBSD 4.3      |      |    |            |             |
   |      |             |      |    |        OpenBSD 2.9       |
   |      |             |      | NetBSD 1.5.1    |             |
   |      |             |      |    |            |             |
   |   FreeBSD 4.4-.    |      | NetBSD 1.5.2    |             |
   |      |        | Mac OS X  |    |            |             |
   |      |        |   10.1    |    |        OpenBSD 3.0       |
   |   FreeBSD 4.5 |    |      |    |            |             |
   |      |         \   |      |    |            |           BSD/OS 4.3
   |   FreeBSD 4.6   \  |      |    |        OpenBSD 3.1       |
   |      |           \ |      | NetBSD 1.5.3    |             |
   |   FreeBSD 4.6.2 Mac OS X  |                 |             |
   |      |            10.2    |                 |             |
   |   FreeBSD 4.7      |      |                 |             |
   |      |             |   NetBSD 1.6       OpenBSD 3.2       |
   |   FreeBSD 4.8      |      |    |            |             |
   |      |             |      | NetBSD 1.6.1    |             |
   |      |--------.    |      |    |        OpenBSD 3.3     BSD/OS 5.0
   |      |         \   |      |    |            |             |
   |   FreeBSD 4.9   |  |      |    |        OpenBSD 3.4     BSD/OS 5.1 ISE
   |      |          |  |      |    |            |
   |      |          |  |      | NetBSD 1.6.2    |
   |      |          |  |      |    |            |
   |      |          |  |      |    |        OpenBSD 3.5
   |      |          |  |      |    v            |
   |   FreeBSD 4.10  |  |      |                 |
   |      |          |  |      |                 |
   |   FreeBSD 4.11  |  |      |                 |
   |                 |  |      |                 |
   |                  `-|------|-----------------|---------------------.
   |                    |      |                 |                      \
  FreeBSD 5.0           |      |                 |                       |
   |                    |      |                 |                       |
  FreeBSD 5.1           |      |                 |                 DragonFly 1.0
   |          \         |      |                 |                       |
   |           ----- Mac OS X  |                 |                       |
   |                   10.3    |                 |                       |
  FreeBSD 5.2           |      |                 |                       |
   |      |             |      |                 |                       |
   |   FreeBSD 5.2.1    |      |                 |                       |
   |                    |      |                 |                       |
   *-------FreeBSD 5.3  |      |                 |                       |
   |           |        |      |             OpenBSD 3.6                 |
   |           |        |   NetBSD 2.0           |                       |
   |           |        |      | |  |            |                DragonFly 1.2.0
   |           |     Mac OS X  | | NetBSD 2.0.2  |                       |
   |           |       10.4    | |  |            |                       |
   |       FreeBSD 5.4  |      | |  |            |                       |
   |           |        |      | |  |        OpenBSD 3.7                 |
   |           |        |      | | NetBSD 2.0.3  |                       |
   |           |        |      | |  |            |                       |
   *--FreeBSD  |        |      | |  v        OpenBSD 3.8                 |
   |    6.0    |        |      | |               |                       |
   |     |     |        |      |  \              |                       |
   |     |     |        |      | NetBSD 2.1      |                       |
   |     |     |        |      |                 |                       |
   |     |     |        |   NetBSD 3.0           |                       |
   |     |     |        |      | |  |            |                DragonFly 1.4.0
   |     |     |        |      | |  |        OpenBSD 3.9                 |
   |  FreeBSD  |        |      | |  |            |                       |
   |    6.1    |        |      | |  |            |                       |
   |     |  FreeBSD 5.5 |      | |  |            |                       |
   |     |              |      | | NetBSD 3.0.1  |                DragonFly 1.6.0
   |     |              |      | |  |            |                       |
   |     |              |      | |  |        OpenBSD 4.0                 |
   |     |              |      | | NetBSD 3.0.2  |                       |
   |     |              |      | NetBSD 3.1      |                       |
   | FreeBSD 6.2        |      |                 |                       |
   |     |              |      |                 |                DragonFly 1.8.0
   |     |              |      |             OpenBSD 4.1                 |
   |     |              |      |                 |                DragonFly 1.10.0
   |     |           Mac OS X  |                 |                       |
   |     |             10.5    |                 |                       |
   |     |              |      |             OpenBSD 4.2                 |
   |     |              |   NetBSD 4.0           |                       |
   | FreeBSD 6.3        |      |                 |                       |
   |            \       |      |                 |                       |
   *--FreeBSD    |      |      |                 |                DragonFly 1.12.0
   |    7.0      |      |      |                 |                       |
   |     |       |      |      |             OpenBSD 4.3                 |
   |     |       |      |      |                 |                DragonFly 2.0.0
   |     |    FreeBSD   |      |             OpenBSD 4.4                 |
   |     |      6.4     |      |                 |                       |
   |     |              |      |                 |                       |
   |  FreeBSD 7.1       |      |                 |                       |
   |     |              |      |                 |                DragonFly 2.2.0
   |  FreeBSD 7.2       |   NetBSD 5.0       OpenBSD 4.5                 |
   |             \      |      |                 |                       |
   |              |     |      |                 |                DragonFly 2.4.0
   |              |     |      |             OpenBSD 4.6                 |
   |              |     |      |                 |                       |
   *--FreeBSD     |     |      |                 |                       |
   |    8.0       |     |      |                 |                       |
   |     |    FreeBSD   |      |                 |                       |
   |     V      7.3     |      |                 |                       |
   |                    |      |                 |                       |
  FreeBSD 9 -current    |  NetBSD -current  OpenBSD -current             |
   |                    |      |                 |                       |
   v                    v      v                 v                       v