I randomly was doing some historical analysis preparing for the next REAPER release (tomorrow), and I noticed that on this day 10 years ago, the REAPER buildfarm first ran. Here's the test commit:

commit 306defecae4c7607b89b318f7caf72dc9ac99e1f (tag: v3.66pre4testb)
Author: justin <justin@4fc7d1b0-fb43-634d-aa29-800e4c0b6062>
Date:   Thu Jul 22 19:36:48 2010 +0000
    WANT_BUILD: 3.66pre4testb

Happy Birthday, autobuild.php!

Here is my analysis (it's noisy, at times, due to CR/LF conversions, updating various libraries, etc):

v3.67    Aug 29 2010 : 567 files changed, 54099 insertions(+), 2957 deletions(-)
v3.671   Aug 29 2010 : 5 files changed, 14 insertions(+), 21 deletions(-)
v3.672   Aug 30 2010 : 8 files changed, 41 insertions(+), 13 deletions(-)
v3.68    Sep 11 2010 : 37 files changed, 709 insertions(+), 337 deletions(-)
v3.69    Sep 20 2010 : 18 files changed, 265 insertions(+), 142 deletions(-)
v3.7     Sep 27 2010 : 17 files changed, 270 insertions(+), 117 deletions(-)
v3.71    Sep 28 2010 : 6 files changed, 35 insertions(+), 14 deletions(-)
v3.72    Oct 19 2010 : 42 files changed, 1911 insertions(+), 224 deletions(-)
v3.73    Nov 17 2010 : 43 files changed, 4197 insertions(+), 180 deletions(-)
v3.74    Dec 24 2010 : 21 files changed, 277 insertions(+), 123 deletions(-)
v3.75    Jan 26 2011 : 26 files changed, 193 insertions(+), 69 deletions(-)
v3.76    Apr 25 2011 : 97 files changed, 3491 insertions(+), 1020 deletions(-)
v3.77    Jul 22 2011 : 24 files changed, 543 insertions(+), 251 deletions(-)
v3.78     Aug 2 2011 : 29 files changed, 366 insertions(+), 107 deletions(-)
v4.0      Aug 3 2011 : 2451 files changed, 138908 insertions(+), 39475 deletions(-)
v4.01     Aug 4 2011 : 18 files changed, 173 insertions(+), 39 deletions(-)
v4.02    Aug 22 2011 : 78 files changed, 4755 insertions(+), 880 deletions(-)
v4.10    Sep 30 2011 : 155 files changed, 20949 insertions(+), 3441 deletions(-)
v4.11    Nov 12 2011 : 186 files changed, 32967 insertions(+), 23010 deletions(-)
v4.111   Nov 13 2011 : 8 files changed, 13 insertions(+), 11 deletions(-)
v4.12    Nov 19 2011 : 18 files changed, 1521 insertions(+), 175 deletions(-)
v4.13    Nov 21 2011 : 8 files changed, 52 insertions(+), 24 deletions(-)
v4.14    Dec 18 2011 : 133 files changed, 5835 insertions(+), 4069 deletions(-)
v4.15    Jan 15 2012 : 196 files changed, 37371 insertions(+), 4690 deletions(-)
v4.20    Mar 20 2012 : 388 files changed, 47263 insertions(+), 20544 deletions(-)
v4.21    Mar 24 2012 : 57 files changed, 12296 insertions(+), 392 deletions(-)
v4.22     Apr 5 2012 : 69 files changed, 390 insertions(+), 1381 deletions(-)
v4.25    Jul 12 2012 : 201 files changed, 21357 insertions(+), 6453 deletions(-)
v4.26    Aug 17 2012 : 246 files changed, 18401 insertions(+), 1558 deletions(-)
v4.30    Nov 13 2012 : 183 files changed, 10010 insertions(+), 2961 deletions(-)
v4.31    Nov 23 2012 : 52 files changed, 869 insertions(+), 357 deletions(-)
v4.32    Jan 15 2013 : 128 files changed, 14765 insertions(+), 2422 deletions(-)
v4.33    Apr 17 2013 : 219 files changed, 16665 insertions(+), 1787 deletions(-)
v4.40    Apr 25 2013 : 102 files changed, 6259 insertions(+), 895 deletions(-)
v4.401   Apr 27 2013 : 18 files changed, 59 insertions(+), 31 deletions(-)
v4.402   Apr 27 2013 : 8 files changed, 36 insertions(+), 14 deletions(-)
v4.5     Aug 29 2013 : 368 files changed, 25469 insertions(+), 27670 deletions(-)
v4.51    Aug 30 2013 : 10 files changed, 212 insertions(+), 61 deletions(-)
v4.52     Sep 5 2013 : 21 files changed, 663 insertions(+), 299 deletions(-)
v4.53     Oct 4 2013 : 93 files changed, 3772 insertions(+), 4109 deletions(-)
v4.54     Oct 7 2013 : 4 files changed, 47 insertions(+), 36 deletions(-)
v4.55    Oct 27 2013 : 95 files changed, 8253 insertions(+), 1605 deletions(-)
v4.56     Nov 8 2013 : 152 files changed, 3625 insertions(+), 1870 deletions(-)
v4.57    Nov 16 2013 : 107 files changed, 3765 insertions(+), 901 deletions(-)
v4.58    Dec 16 2013 : 116 files changed, 12598 insertions(+), 2454 deletions(-)
v4.581   Dec 17 2013 : 21 files changed, 433 insertions(+), 102 deletions(-)
v4.59    Jan 13 2014 : 142 files changed, 13507 insertions(+), 7446 deletions(-)
v4.591   Jan 17 2014 : 8 files changed, 251 insertions(+), 246 deletions(-)
v4.60    Feb 28 2014 : 638 files changed, 230240 insertions(+), 17928 deletions(-)
v4.601    Mar 2 2014 : 5 files changed, 25 insertions(+), 9 deletions(-)
v4.602    Mar 2 2014 : 4 files changed, 25 insertions(+), 24 deletions(-)
v4.61    Mar 20 2014 : 132 files changed, 4096 insertions(+), 2087 deletions(-)
v4.611   Apr 13 2014 : 64 files changed, 2871 insertions(+), 462 deletions(-)
v4.62    May 12 2014 : 215 files changed, 3858 insertions(+), 2270 deletions(-)
v4.7     Jul 10 2014 : 191 files changed, 8334 insertions(+), 3350 deletions(-)
v4.71    Jul 15 2014 : 35 files changed, 530 insertions(+), 321 deletions(-)
v4.72    Aug 14 2014 : 94 files changed, 3311 insertions(+), 1139 deletions(-)
v4.721   Aug 19 2014 : 12 files changed, 30 insertions(+), 18 deletions(-)
v4.73    Sep 17 2014 : 85 files changed, 4013 insertions(+), 276 deletions(-)
v4.731   Sep 26 2014 : 9 files changed, 1612 insertions(+), 20 deletions(-)
v4.75     Nov 7 2014 : 93 files changed, 1497 insertions(+), 2181 deletions(-)
v4.76    Dec 15 2014 : 1743 files changed, 2014 insertions(+), 19752 deletions(-)
v5.0     Aug 11 2015 : 4449 files changed, 291272 insertions(+), 39450 deletions(-)
v5.01    Aug 26 2015 : 123 files changed, 17743 insertions(+), 11269 deletions(-)
v5.011   Sep 10 2015 : 4 files changed, 17 insertions(+), 3 deletions(-)
v5.02    Sep 22 2015 : 139 files changed, 5708 insertions(+), 3344 deletions(-)
v5.03    Sep 24 2015 : 14 files changed, 169 insertions(+), 51 deletions(-)
v5.04     Oct 1 2015 : 27 files changed, 460 insertions(+), 129 deletions(-)
v5.1     Nov 14 2015 : 159 files changed, 10791 insertions(+), 3460 deletions(-)
v5.11    Dec 25 2015 : 195 files changed, 25500 insertions(+), 5874 deletions(-)
v5.111   Jan 12 2016 : 27 files changed, 242 insertions(+), 77 deletions(-)
v5.12    Jan 21 2016 : 179 files changed, 7582 insertions(+), 2736 deletions(-)
v5.15     Feb 9 2016 : 123 files changed, 4247 insertions(+), 2494 deletions(-)
v5.16     Mar 3 2016 : 96 files changed, 5232 insertions(+), 1208 deletions(-)
v5.17    Mar 24 2016 : 111 files changed, 17317 insertions(+), 1262 deletions(-)
v5.18     Apr 4 2016 : 43 files changed, 959 insertions(+), 192 deletions(-)
v5.20    May 17 2016 : 284 files changed, 29563 insertions(+), 4198 deletions(-)
v5.201   May 23 2016 : 8 files changed, 57 insertions(+), 18 deletions(-)
v5.21    Jun 15 2016 : 71 files changed, 2045 insertions(+), 1270 deletions(-)
v5.211   Jun 19 2016 : 11 files changed, 152 insertions(+), 69 deletions(-)
v5.22    Jul 14 2016 : 88 files changed, 3191 insertions(+), 850 deletions(-)
v5.23    Aug 13 2016 : 93 files changed, 7934 insertions(+), 3799 deletions(-)
v5.24     Sep 4 2016 : 75 files changed, 2246 insertions(+), 854 deletions(-)
v5.25    Sep 19 2016 : 264 files changed, 2827 insertions(+), 1372 deletions(-)
v5.26     Oct 5 2016 : 37 files changed, 855 insertions(+), 366 deletions(-)
v5.27    Oct 19 2016 : 41 files changed, 2850 insertions(+), 544 deletions(-)
v5.28     Nov 6 2016 : 84 files changed, 2655 insertions(+), 1392 deletions(-)
v5.29    Nov 25 2016 : 68 files changed, 4384 insertions(+), 3591 deletions(-)
v5.30    Dec 18 2016 : 231 files changed, 14626 insertions(+), 9300 deletions(-)
v5.31    Dec 24 2016 : 1021 files changed, 126 insertions(+), 285150 deletions(-)
v5.311   Dec 27 2016 : 10 files changed, 26 insertions(+), 18 deletions(-)
v5.32    Jan 15 2017 : 173 files changed, 32914 insertions(+), 13114 deletions(-)
v5.33     Feb 4 2017 : 48 files changed, 2551 insertions(+), 1198 deletions(-)
v5.34    Feb 22 2017 : 67 files changed, 1042 insertions(+), 642 deletions(-)
v5.35    Feb 28 2017 : 20 files changed, 121 insertions(+), 32 deletions(-)
v5.40    Mar 23 2017 : 112 files changed, 5515 insertions(+), 1297 deletions(-)
v5.50    Sep 13 2017 : 368 files changed, 33265 insertions(+), 11592 deletions(-)
v5.51    Sep 28 2017 : 90 files changed, 1593 insertions(+), 622 deletions(-)
v5.52     Oct 3 2017 : 11 files changed, 51 insertions(+), 32 deletions(-)
v5.60    Oct 23 2017 : 197 files changed, 28306 insertions(+), 3367 deletions(-)
v5.61    Oct 27 2017 : 21 files changed, 142 insertions(+), 78 deletions(-)
v5.62     Nov 7 2017 : 53 files changed, 1547 insertions(+), 923 deletions(-)
v5.7     Dec 12 2017 : 268 files changed, 52301 insertions(+), 2872 deletions(-)
v5.70    Dec 12 2017 : 14 files changed, 15 insertions(+), 26 deletions(-)
v5.75    Feb 16 2018 : 344 files changed, 5973 insertions(+), 5858 deletions(-)
v5.76    Feb 19 2018 : 20 files changed, 182 insertions(+), 113 deletions(-)
v5.77     Mar 8 2018 : 40 files changed, 1260 insertions(+), 308 deletions(-)
v5.78    Mar 24 2018 : 59 files changed, 3495 insertions(+), 2821 deletions(-)
v5.79    Apr 16 2018 : 144 files changed, 1869 insertions(+), 962 deletions(-)
v5.80    Apr 24 2018 : 32 files changed, 361 insertions(+), 104 deletions(-)
v5.90    May 23 2018 : 109 files changed, 4021 insertions(+), 1999 deletions(-)
v5.91     Jun 2 2018 : 46 files changed, 382 insertions(+), 138 deletions(-)
v5.92    Jun 20 2018 : 50 files changed, 2345 insertions(+), 1762 deletions(-)
v5.93    Jul 17 2018 : 92 files changed, 18145 insertions(+), 514 deletions(-)
v5.94     Aug 2 2018 : 130 files changed, 28495 insertions(+), 6527 deletions(-)
v5.941    Aug 4 2018 : 7 files changed, 33 insertions(+), 13 deletions(-)
v5.95    Sep 10 2018 : 139 files changed, 3593 insertions(+), 794 deletions(-)
v5.96     Oct 8 2018 : 73 files changed, 1864 insertions(+), 636 deletions(-)
v5.961   Oct 18 2018 : 29 files changed, 443 insertions(+), 189 deletions(-)
v5.962   Nov 16 2018 : 780 files changed, 199373 insertions(+), 40684 deletions(-)
v5.963   Nov 21 2018 : 6 files changed, 34 insertions(+), 15 deletions(-)
v5.964   Dec 17 2018 : 115 files changed, 3749 insertions(+), 1464 deletions(-)
v5.965   Dec 18 2018 : 15 files changed, 70 insertions(+), 27 deletions(-)
v5.97    Feb 21 2019 : 172 files changed, 24428 insertions(+), 3727 deletions(-)
v5.971   Feb 25 2019 : 13 files changed, 169 insertions(+), 81 deletions(-)
v5.972    Mar 6 2019 : 75 files changed, 1877 insertions(+), 579 deletions(-)
v5.973   Mar 11 2019 : 26 files changed, 284 insertions(+), 57 deletions(-)
v5.974    Apr 6 2019 : 83 files changed, 2747 insertions(+), 1552 deletions(-)
v5.975   Apr 29 2019 : 183 files changed, 6242 insertions(+), 3998 deletions(-)
v5.976    May 2 2019 : 21 files changed, 159 insertions(+), 118 deletions(-)
v5.977    May 6 2019 : 14 files changed, 152 insertions(+), 83 deletions(-)
v5.978   May 10 2019 : 29 files changed, 331 insertions(+), 312 deletions(-)
v5.979   Jun 17 2019 : 82 files changed, 2838 insertions(+), 1029 deletions(-)
v5.980   Jul 11 2019 : 59 files changed, 1348 insertions(+), 478 deletions(-)
v5.981   Jul 21 2019 : 32 files changed, 347 insertions(+), 128 deletions(-)
v5.982   Aug 17 2019 : 70 files changed, 1855 insertions(+), 609 deletions(-)
v5.983   Aug 29 2019 : 29 files changed, 178 insertions(+), 92 deletions(-)
v5.984   Oct 11 2019 : 39 files changed, 804 insertions(+), 247 deletions(-)
v5.985   Nov 13 2019 : 107 files changed, 1881 insertions(+), 1004 deletions(-)
v5.986   Nov 18 2019 : 41 files changed, 11893 insertions(+), 116 deletions(-)
v5.987   Nov 19 2019 : 15 files changed, 68 insertions(+), 19 deletions(-)
v6.0      Dec 3 2019 : 2872 files changed, 32398 insertions(+), 14335 deletions(-)
v6.01     Dec 6 2019 : 91 files changed, 547 insertions(+), 447 deletions(-)
v6.02    Dec 16 2019 : 595 files changed, 1865 insertions(+), 842 deletions(-)
v6.03    Jan 13 2020 : 52 files changed, 854 insertions(+), 585 deletions(-)
v6.04    Feb 20 2020 : 131 files changed, 5384 insertions(+), 1148 deletions(-)
v6.05     Mar 5 2020 : 58 files changed, 2451 insertions(+), 898 deletions(-)
v6.06    Mar 28 2020 : 501 files changed, 1308 insertions(+), 250389 deletions(-)
v6.07    Mar 29 2020 : 4 files changed, 11 insertions(+), 7 deletions(-)
v6.08     Apr 3 2020 : 63 files changed, 1585 insertions(+), 880 deletions(-)
v6.09    Apr 27 2020 : 135 files changed, 6386 insertions(+), 9265 deletions(-)
v6.10     May 9 2020 : 126 files changed, 5546 insertions(+), 2309 deletions(-)
v6.11    May 23 2020 : 795 files changed, 5893 insertions(+), 22413 deletions(-)
v6.12    Jun 14 2020 : 611 files changed, 7911 insertions(+), 120505 deletions(-)
v6.13    Jul 22 2020 : 297 files changed, 9595 insertions(+), 3189 deletions(-)