Developers and publishers can have a tile game listed here. Send the details to hello@144mahjong.com and you will get an answer either way.
What to include: a playable link or an embeddable build, the title, the studio name, and a sentence describing the mechanic — whether tiles are stacked or flat, whether a clock runs, and what a player is actually matching. A preview image at 512×512 or wider helps, and its absence will not stop a listing.
What gets accepted: boards that run in a modern browser without a plug-in, load in a few seconds, and behave at desktop resolutions as well as on a phone. What does not: near-copies of layouts already listed, anything requiring an account before the first move, and builds whose adverts interrupt play.
Listing is free and there is no exchange of links or payment in either direction.