Soartex was created by Soar49. He first posted his work on February 1, 2011, and stopped development in November 2011. This repository only contains assets created by Soar49.
The original forum link is here: https://www.minecraftforum.net/forums/mapping-and-modding-java-edition/resource-packs/1224430-64x64-beta1-8-1-1-9pre4-soartex-hd-smooth-texture