If you wish to develop your own Geared Towards Loner game, you are welcome to do so. The Creative Commons licence has been put in place for this purpose.
Loner is a product of Zotiquest Games (https://zotiquestgames.com/). Its full text is available for use under the Creative Commons Attribution Share-Alike CC BY-SA 4.0 license.
To make your own Geared Towards Loner game, simply include the following text in your game:
This work is an independent production by [Publisher Name] and is based on Loner, developed and authored by Roberto Bisceglie, and licensed for our use under the Creative Commons Attribution 4.0 License https://creativecommons.org/licenses/by/4.0/. [Publisher Name] is not affiliated with Zotiquest Games.
If you want, you may use the following image to identify your game as a "Geared Towards Loner". You can find the png file in the Creator's Kit folder.
The text of the Loner System Reference Document containing all the Core Rules is available at https://lonersrd.zotiquestgames.com.
To help creators developed their game, Zotiquest Games provide a template to be fill up.
It comes in two flavors:
Affinity Publisher Package: it maintains the original trade dress of Loner, including typefaces. You can you use it in accordance with the terms of the License or modify it. Make clear that your game is an independant production not affiliated with Zotiquest Games.
A raw txt file: for those who want to develop the text before thinking about layouts.