Updated and republished for macOS 10.15.7; skip it unless you really really care about all the macOS releases. Originally published on November 14th, 2005.

Versions of Apple's Mac operating system used to be named after big cats, but that all changed with Mac OS X 10.9, which took its name from a Californian surfing spot (or possibly a dog).Apple.

Below the break is a table showing all major releases of macOS (previously Mac OS X) from the public beta through the latest public version, which is macOS 10.15.7, as of September 23rd, 2020—the 138th release in total.

Start quickly with the most recent versions of Word, Excel, PowerPoint, Outlook, OneNote and OneDrive —combining the familiarity of Office and the unique Mac features you love. Work online or offline, on your own or with others in real time—whatever works for what you’re doing.
From the release of Mac OS X 10.0 Cheetah until OS X 10.8 Mountain Lion, Apple referred to the operating system by the name of a big cat. From OS X 10.9 Mavericks, Apple switched the naming.
Music, TV, and podcasts take center stage. ITunes forever changed the way people experienced.

Settlers 8 for mac catalina. Note: Click the ⓘ symbol to read Apple's release notes for a given update.

The following was culled from Apple's support downloads page, and as such, some of the dates may be off just a bit. If you know for certain that something is incorrect, please let me know and I'll get it fixed. (Scroll to see all entries.)

Date	Version	Comments
2020	Sep 23	42	10.15.7	2.86 GB	ⓘ
	Aug 12	28	10.15.6 SU1	3.22GB GB	ⓘ
	Jul 15	44	10.15.6	3.35 GB	ⓘ
	Jun 1	6	10.15.5 SU1	1.59 GB	ⓘ
	May 26	48	10.15.5	3.37 GB	ⓘ
	Apr 8	15	10.15.4 SU1	1.38 GB	ⓘ
	Mar 24	56	10.15.4	3.0 GB	ⓘ
	Jan 28	49	10.15.3	3.0 GB	ⓘ
2019	Dec 10	42	10.15.2	3.0 GB	ⓘ
	Oct 29	14	10.15.1	4.5 GB	ⓘ
	Oct 15	8	10.15 SU1	985 MB	No info page
	Oct 7	11	10.15	4.9 GB	ⓘCatalina - You need more permission!
	Sep 26	31	10.14.6 SU3	1.32 GB	ⓘ
	Aug 26	25	10.14.6 SU2	1.25 GB	ⓘ
	Aug 1	10	10.14.6 SU1	949 MB	ⓘ
	Jul 22	70	10.14.6	2.7 GB	ⓘ
	May 13	49	10.14.5	2.5 GB	ⓘ
	Mar 25	62	10.14.4	2.8 GB	ⓘ
	Jan 22	48	10.14.3	2.0 GB	ⓘ
2018	Dec 5	28	10.14.2	2.5 GB	ⓘ
	Nov 7	8	10.14.1 SU1	1.3 GB	ⓘ For 2018 MacBook Air
	Oct 30	36	10.14.1	3.3 GB	ⓘ
	Sep 24	27	10.14	5.2 GB	ⓘ Mojave - You need permission!
	Aug 28	38	10.13.6 SU2	1.32 GB	ⓘ For 2018 Touch Bar MBP…again
	Jul 24	15	10.13.6 SU1	1.31 GB	ⓘ For 2018 Touch Bar MBP
	Jul 9	38	10.13.6	1.32 GB	ⓘ AirPlay 2
	Jun 1	64	10.13.5	2.12 GB	ⓘ Messages in iCloud
	Mar 29	37	10.13.4	2.36 GB	ⓘ Sortable Safari bookmarks!!
	Feb 20	28	10.13.3 SU	40.4 MB	ⓘ Indian character/Messages crash fix
	Jan 23	33	10.13.3	1.97 GB	ⓘ
	Jan 8	33	10.13.2 SU	633.6 MB	ⓘ Spectre and Meltdown fixes
2017	Dec 6	36	10.13.2	2.08 GB	ⓘ
	Oct 31	26	10.13.1	1.47 GB	ⓘ
	Oct 5	10	10.13 SU	915 MB	ⓘ Addresses two security issues
	Sep 25	68	10.13	4.8 GB	ⓘ High Sierra - Higher in the mountains?
	Jul 19	65	10.12.6	1.98 GB	ⓘ
	May 15	49	10.12.5	1.57 GB	ⓘ
	Mar 27	63	10.12.4	1.56 GB	ⓘ Night Shift
	Jan 23	41	10.12.3	1.05 GB	ⓘ
2016	Dec 13	50	10.12.2	1.94 GB	ⓘ
	Oct 24	34	10.12.1	1.36 GB	ⓘ
	Sep 20	64	10.12	4.77 GB	ⓘ Sierra - Still in the mountains.
	Jul 18	63	10.11.6	759 MB	ⓘ
	May 16	57	10.11.5	759 MB	ⓘ
	Mar 20	61	10.11.4	1.58 GB	ⓘ
	Jan 19	41	10.11.3	662 MB	ⓘ
2015	Dec 9	49	10.11.2	1.4 GB	ⓘ
	Oct 21	21	10.11.1	1.19 GB	ⓘ
	Sep 30	48	10.11	6.08 GB	ⓘ El Capitan - Go climb something!
	Aug 13	44	10.10.5	1.02 GB	ⓘ
	Jun 30	75	10.10.4	1.09 GB	ⓘ
	Apr 16	8	10.10.3 SU	1.8 MB	ⓘ Supplemental Update
	Apr 8	71	10.10.3	1.52 GB	ⓘ Includes Photos app
	Jan 27	71	10.10.2	544 MB	ⓘ
2014	Nov 17	32	10.10.1	311 MB	ⓘ
	Oct 16	29	10.10	5.2 GB	ⓘ Yosemite - No surfers here.
	Sep 17	79	10.9.5	139 MB	ⓘ
	Jun 30	46	10.9.4	283 MB	ⓘ
	May 15	79	10.9.3	461 MB	ⓘ
	Feb 25	71	10.9.2	460 MB	ⓘ
2013	Dec 16	55	10.9.1	243.4 MB	ⓘ
	Oct 22	19	10.9	5.3 GB	ⓘ Mavericks - All out of big cats!
	Oct 3	21	10.8.5 SU	19.6 MB	ⓘ Supplemental Update
	Sep 12	100	10.8.5	273.7 MB	ⓘ
	Jun 4	82	1

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