This is a list I made on google docs, but I feel it would be nice for all users to have access to it.
Updated to 1.7.10
Nuclear Control 2 [Shoutout for myself]
Gregtech [Note: Considered Total-Conversion]
Ztech
Advanced Machines [AtomicStryker]
CompactSolars
Iridium Mod
Mining Laser mini-mod for MCPC+
Advanced Machines [Immibis]
Advanced Repulsive Systems
Gravitation Suite
Turbo [Note: is not an actually addon, but is used for other addons]
Bio Materials
IC2 Tweaks
Advanced Solar Panels
IHL Tools & Machines
EnetBridge
Advanced Power Management [Go here , I'm the new hopefully temporary maintainer]
VoidTech
Carbon Tech Addon
AFSU Mod
Simple-IC2-Quarry
SkyTech Crops
Electro-Magic Tools
IC2 Backback HUD
GalacticGreg [Gregtech addon]
Water Power
Power Utilities
Realistic Explosives
ElectricalAdditions
GTExtras [Gregtech addon]
GemBlocksForGreg [Gregtech addon]
Minetweaker Addon for Gregtech [Gregtech addon]
Armour and Tool Status HUD
Just a bunch of IC2 machines
Updated to 1.7.2
Note: most of these mods aren't going to work with 1.7.10
The Bearded Potato (Electrical beacons)
Industrial Agriculture
CompactWatermills
Update to 1.7.X Announced
Modular Force Field System [Minalien]
Update Pending
Transducers
Unidye
Quantum Pack
AdvGenerators^3
NuclearPower
Officially Discontinued
Transformer Converters [Replaced by Transformer Convertors 2]
LevelStorage [Modder unhappy with his mod]
Recipes Fixer mini-mod [IC2 fixed this bug]
ChargePads [Integrated with IC2]
CompactWindmills [Integrated with IC2]
Portable Recharger [Integrated with IC2]
GregArmor [Gregtech addon] [Modder left modding]
Feel free to tell me about the dozens of mods I forgot about
Oh, and check out the next post for other recommended mods!