GregTech: New Horizons is an expert pack focused heavily on the tech mod GregTech. GregTech is notorious for having realistic tech progress and recipe changes that reflect that. A small example being you can't create sticks without having a saw. This pack will be a struggle, completing the tech progression curve of this pack will not be easy or quick. To spice things up however, it does also integrate a variety of other mods, some examples include: Botania, Extra Utilities, Forestry, Galacticraft and Witchery. This modpack is using an older version of minecraft (1.7.10) so it is able to feature Thaumcraft 4, arguably the most complete version of Thaumcraft.
If you're up for a challenge or interested in trying out a modded server with some of the classic mods, come check it out!
Server Address: m.mcnsa.com
Mod pack link: https://www.curseforge.com/minecraft/modpacks/gt-new-horizons version 2.7.4