I've written and published enough worldbuilding essays now that I'm getting concerned that they may be getting difficult to keep track of, especially since they're posted loosely in this forum with no real organisation aside from their numbering. I also get the impression that some people might be afraid to comment on them in the future for fear of bumping them around the forum. The obvious solution to both is to have an index which provides handy links to all of them in order, and grouping them by series, so here it is.

I'm also going to note here when each essay was posted and when it last underwent revisions. Most revisions aren't particularly significant, but the more recently it was revised, the more likely it is that the information is up to date.

Index:
Canon:
-Story archival - Revised 05/07/20
-Story chronology - Posted 05/07/20
-Primary canon - Posted 25/09/20

History:
-History Part 1 - Pre-Earth - Revised 06/12/19
-History Part 2 - Ancient Earth - Revised 08/12/19
-History Part 3 - Pre-Classical Era - Revised 15/12/19
-History Part 4 - Classical Era - "Era of the Two Sisters" - Posted 13/02/21
-History Part 5 - Classical Era - Reign of Chaos - Posted 14/02/21

Locations:
-Locations Part 1 - Creation - Revised 06/12/19
-Locations Part 2 - The Nine Realms - Revised 06/12/19
-Locations Part 3 - Earth - Revised 06/12/19

Culture:
-Equestrian Culture Part 1 - Religion - Revised 20/07/20
-Equestrian Culture Part 2 - Government and Military - Revised 20/07/20
-Equestrian Culture Part 3 - Values and Morality - Revised 20/07/20
-Equestrian Culture Part 4 - Names and Family - Revised 20/07/20
-Equestrian Culture Part 5 - Language - Revised 20/07/20

Species:
-Species Part 1 - Equines - Revised 30/03/19
-Species Part 2 - Equine Chimeras - Revised 30/03/19

Magic:
-Borderworld Magic Part 1 - Magic types - Revised 30/03/19
-Borderworld Magic Part 2 - Souls - Revised 30/03/19
-Borderworld Magic Part 3 - Using magic - Revised 30/03/19
-Magical Items Part 1 - The Eternal Elements - Posted 11/04/22

Pantheon:
-Borderworld Pantheon Part 1 - Elder Gods and Outer Gods - Revised 06/12/19
-Borderworld Pantheon Part 2 - Greater Deities - Eternals - Revised 06/12/19
-Borderworld Pantheon Part 3 - Greater Deities - The Great Wyrms of Time - Revised 06/12/19
-Borderworld Pantheon Part 4 - Lesser Deities - Earth Gods - Revised 06/12/19
-Borderworld Pantheon Part 5 - Lesser Deities - Alien Gods - Posted 04/10/20

Timelines:
-Remarked Timelines Part 1 - Overview - Revised 16/04/19
-Remarked Timelines Part 2 - The Sombra Timeline - Revised 16/04/19
-Remarked Timelines Part 3 - The Chrysalis Timeline - Revised 16/04/19
-Remarked Timelines Part 4 - The Nightmare Timeline - Revised 16/04/19
-Remarked Timelines Part 5 - The Tirek Timeline - Revised 16/04/19
-Remarked Timelines Part 6 - The Discord Timeline - Revised 16/04/19
-Remarked Timelines Part 7 - The Flim Flam Timeline - Revised 16/04/19
-Remarked Timelines Part 8 - The Wasteland Timeline - Revised 16/04/19
-Alternate Universes Part 1 - Overview - Posted 12/01/21

Lore snippet blogs:
-Borderworld lore snippets 1 - Posted 15/03/20
-Borderworld lore snippets 2 - Posted 23/03/20
-Borderworld lore snippets 3 - Posted 22/07/22

Supplementary material:
-Van Helsing - House Songbird and Offshoots (spoiler-free) - Revised 24/09/20
-To Keep the Fire Burning - The World on Fire (spoiler-free) - Revised 25/09/20
-Dragonfall - Map of Dragonfall - Posted 28/06/22
-Part of a Pantheon - File 7GBQ-RR3S2654B: DISCORD - Revised 05/07/20

Note 1: As of 20/10/16, I'm going to start adding an acknowledgements section to each essay, to properly credit my many fandom inspirations for this project. Fair's fair, after all.

Note 2: As of 20/03/19, it also seemed prudent to start adding all the non-essay supplementary material I've written to the index.

Note 3: As of 20/07/20, all currently published lore essays have been revised to my satisfaction within the past two years, and are thus mostly up to date. As the show is long over, it is unlikely that there will be many more major revisions after this, so for the most part, you can consider these to be the final versions.