Download GregTech from this place.
There is also a Default Config Pack, that I made, so you don’t have to disable most of the other Mods Worldgen yourself.
I do not check if any of these Wikis are even up to date, but I guess some of them are.
A Russian Wiki: http://ru.minecraftwiki.net/GregTech
A Japanese Wiki: http://www26.atwiki.jp/minecraft/pages/853.html
Another Japanese Wiki: http://www26.atwiki.jp/minecraft/pages/1295.html
And another Japanese Wiki: http://www46.atwiki.jp/greg/
Install NEI, I know it's not the best quality, but it is basically a requirement.
If you don't know how to do a certain task or how to acquire certain Items follow these simple Steps:
Step 1: Look for the Items Recipes in NEI. And go through ALL the Pages not just the first one. NEI isn't Google, the non-first Pages do contain useful Information.
Step 2: Go through all the GregTech Tools and read their full Tooltips. For example the Hammer crushes Blocks in World, meaning NEI doesn't show the Ore->Crushed Recipe
Resource Packs & Language Packs
Currently all GT compatible Texture Packs known to me, are listed in this Forum. I am too lazy to list all of them myself, so just go to the linked Forum Board. They should have GT in their Title.
Currently all GT compatible Language Packs known to me, are listed in this Forum. I am too lazy to list all of them myself, so just go to the linked Forum Board. They should have GT in their Title.
Note: there is an unholy and steadily growing amount of Language Text and Texture Files in GT6, so most definitely not all of those Packs are complete.