From what has been found online and in print, it appears that Dr. Flint created 4 websites which are all offline today. Thankfully, most of the information on them has been archived on the Way Back Machine by the Internet Archive project.

N.B. Links to the Way Back Machine are usually slow to load and often contain broken links and/or missing images.

Emotional-Freedom.com

This website was built to accompany Dr. Flint’s first book on the Emotional Freedom Technique (EFT).
For more info on this book – Emotional Freedom (1999) – click here.

The site also includes a preliminary report on a pilot study of EFT involving more than 29,000 patients from 11 treatment centers in South America, by Joaquin Andrade, M.D. and David Feinstein, Ph.D.
This report and other articles (including a look at brain scans) from Emotional-Freedom.com have been reconstructed and can be found via this link on the Articles tab:

If you wish to check out the original versions of those articles and webpages, here is the best working Way Back Machine link:
https://web.archive.org/web/20160313083338/http://www.emotional-freedom.com:80/index.html

Process-Healing.com

This website was built to accompany Dr. Flint’s first book on the Process Healing Method (PHM).
For more info on this book – A Theory and Treatment of Your Personality (2006) – click here.
The site has some helpful information on how the PHM was formed and how it differs from hypnosis.

It also has links to articles Garry wrote on Learning Theory and Chaos/Complexity Theory which have been reconstructed on this site here. Dr. Flint also built an 11 page course for those wishing to go through the Process Healing Method by themselves. Unfortunately, aside from the first introduction page, the rest of the course is now lost to time as they were not archived on the Way Back Machine.

He also produced a handy ‘UPGRADE’ pamphlet/PDF that delved more deeply into more troublesome issues. This too now seems to be lost to time. Fortunately, most of the same information can be found in A Theory and Treatment of Your Personality (2006).

Here is a ‘fair enough’ working link on the Way Back Machine:
https://web.archive.org/web/20160315053841/http://www.process-healing.com/

GarryAFlint.com

This was Dr. Flint’s online blog that was mostly populated in 2014. There are further articles as well as replies to comments that students of the PHM will find insightful. There is also a link to the website Manifesting All Possibilities, which was the original name for the Make Anything Possible™ (MAP) Method that sprang from Dr. Flint’s tutelage of Colette Streicher, a Licensed Master Social Worker (LMSW) based in Texas, U.S.A.. To view the MAP Coaching Institute website, click here.

Aside from the very first article posted on his blog, (which is a duplicate of this caveat here) the rest of the articles have been reconstructed on this site here.

For those who would like to read it on the original blog, here is the most recent working Way Back Machine link:
https://web.archive.org/web/20181119210557/http://www.garryaflint.com/

NeoSolTerric.com

This was Dr. Flint’s self-publishing website. It provided links to his 4 books as well as additional articles. The information on NeoSolTerric.com has been largely reconstructed here (with additional helpful information) on the Resources page.

Here is the most recent working Way Back Machine link:
https://web.archive.org/web/20200221025215/http://www.neosolterric.com/