FactoryCraft
FactoryCraft is a modern take on Tekkit if it had been combined with a exploration heavy modpack. It comes with the stable mods in tekkit (AE2, IC2, Buildcraft, etc) along with new biomes, procedurally generated dungeons (rouge-like dungeons mod) and more. It was inspired by a recent playthrough of Satisfactory, which at a glance is just a "tech heavy" game, but it has vast exploration mechanics that are hidden until you progress into the game.
Installing this modpack
You can install it via CurseForge, or via modpacker
License
While the License is "Apache License 2.0" that only applies to everything I've created, all mods and their source code are owned by their respective owners and covered under their respective licenses