I know about mantra-meditation, just didn't know the term. I'll have to come up with a mantra that is meaningful to me and see what happens. I would assume we're allowed to try different mantras if we're not as satisfied with the first, right?
I haven't explored the jyoti site you linked yet I do have it up to have a closer look. The mindfulness site I've shared to other people, including on my FB page, and people liked it enough to comment and share.
As for dogma on that site (and elsewhere) I'm not religious (just spiritual with certain beliefs) so dogma can be bothersome to me, too. At least with a website, you can ignore that kind of thing and distill it down to the pertinent and useful information. I'll look for a Kindle version of Harris' book as I can at least read a chapter for free first (the digital method of "thumbing through a book."
The noise website has its own thread in this group now, but I will link it again here: MyNoise.net
The link in the middle of the page, Online Noises, is where you will find all of the pages with the different sounds. The site's owner, Dr. Stephane Pigeon, has done a fair amount of research on the use of sound for healing purposes, such as tinnitus. Thus, most of his pages can be calibrated to your hearing curve. Not truly what you need if using the sounds for meditation, just to point out the broad "spectrum" he covers with his site
There are many pages of natural sounds, too (water, wind, rain, insects, birds, even farm animals) so you can recreate some outdoor setting you like, including an oasis (that link is one I made with the function "Save in URL" so you can do that same once you've made a setting you like and want to keep.) I'm pretty sure you could create almost any natural soundscape you can imagine, especially by either opening multiple pages at once or using another function called Super Generators. If there's some outdoor landscape in your mind that would be perfect for meditating, create it and see what happens