The official changelog, though poorly formatted, can be found on the GTNH forums.
Code and quest changes, for each version listed below, can be found on their respective post on the original forum thread. They are not placed here because their format changes wildly and there are often far too many to list.
TODO: All versions from 1.1.0.0 to 1.5.1.1, list most recent first, and oldest last (at the bottom).
2.0.1.1
Mod Changes
Change
Name
New Version
Removed
Utility Mobs
3.1.1
Updated
Better Questing
1.0.173 unofficial
Updated
Gregtech
5.09.32.07
Updated
GTNewHorizonsCoreMod
1.5.11
Updated
GT++
1.6.09
Updated
Open Computers
Build 1086
Updated
Open Security
1.0.104
Updated
Quest Book
1.1.0 unofficial
Updated
TecTech
3.5.2a
Changed/Added Recipes
Mod Name
Description
Buildcraft
Ordict Cobllestone Rods
Forestry
Added recipe to remove nbt data of Beealyzer and Treealyzer
Code Changes
Mod Name
Description
Issues ID
2.0.1.0
This changelog has beed modified into human readable form which also contains more usefull information. We hope in the future that every changelog can look more like this one.
Mod Changes
Change
Name
New Version
Added
Better Achievements
0.1.0
Added
Nature's Compass
1.3.1
Updated
GregTech
5.09.32.06
Updated
GTNewHorizonsCoreMod
1.5.10
Updated
GT++
1.6.07
Updated
Spice of Life
1.3.11
Updated
Storage Drawers
1.10.9
Updated
TecTech
3.5.2
Updated
Thaumic Exploration
1.1.71-0
Other Changes
Mod Name
Description
Core Mod
Edits to transformer render
Recipe gating fixes for Railcraft machines in LV
Quest for making concrete from marble
Buff of wet transformers (now store 4 times energy)
Changes to transformer code. Now requires GT++
Moved high-amp transformers to coremod and added more of them
Fix of extruder consuming wire mold when making glass fiber
Removed GT tool and weapon parts
Empty shape plate in bender now require 8 times less materials
Added lapotron crystal assembler recipe
Added universal AE2 storage housing recipe in assembler
Fix of being unable to craft Adv. Nano Chestplate and Jetpack
Made high-amp transformers harder to make
Fixes to wet transformer tooltips and code
Added assembler recipe for Nature's Compass mod
GregTech
Rotor solder used in recipe reverted to 16*n instead of 18*n
Fixed Microwave Energy Transmitter crash when opening GUI after extracting nitrogen plasma
Added more oil drills 3x3 and 6x6 chunk and cave back-filler
Added P2P support for GT energy system
ODP speed was improved
Rebalanced charcoal electrolyse by-product
Rebalanced Nitric Acid cost/usage
Ores now generate in marble and basalt
Fixed T2 and T3 oil drill recipes
Increased amount of pure silver in galena vein to compensate for partial galena -> silver recipe removal
Fixed Rotor Mold getting consumed in the Fluid Soldifier
Fixed Heat Proof Casings Outputting 2x in the Assembling Machine
Raw Styrene Butadiene Rubber now outputs 4 cells instead of 16
Fixed brewery biomass recipes
Added forestry compost recipes to Mixer
Rebalanced Forestry biomass recipes
Changed Fluid Extractor recipes from fruits to juice
Fixed Electrolyser processing water instantly
Changes to LHE, turbines and steam turbines
Added fish oil recipe from pam's fish
Naquadah fluid cells re-enabled
Fixed Basic Miner being unable to work with battery in its slot
Costs of all drillers rebalanced
GT++
Added Pahoehoe to Thermal Boiler
Added Project Table
Finished Power Sub-Station multiblock
Fixed Tree Farm giving reduced output
Added Large Ore Washing Plant
Fixed cable and pipe bounding box and rendering issues
Rebalanced Ammonia
Fixed Sensor recipes
Fixed some tooltips
Added 3 new tiers of Semi-Fluid generators
NewHorizons Modpack
Quest fixes
Disabled requirement of machine having free side to access it
Enabled WUSS mode back
BC Robots were enabled
Nuclear power nerfed 10x --> 5x
Re-enabled Forge loading screen
Nerfed GT++ steam boilers
Bismuth now generate on Mars, Mercury, Phobos, Titan, VegaB