My favourite IE mods are those that don't add new content to the games, but rather improve in some way the original content. These include mods like SCS, which (among other things) improves the AI, The Tweaks Anthology, which provides lots of little tweaks, etc. In this thread I want to create a list of the mods that fit this concept. The list includes the name of each mod, a link to its main web page, a very short description, and a list of supported games. I start with the mods I currently use:
Sword Coast Stratagems: Vastly improves the game AI and offers some handy tweaks. Supports BGEE, BG2(EE), SoD, EET, BGT, EasyTUTU, and all their expansions.
Tactics: Adds many components to BG2 that aim to make the game more challenging and rewarding by increasing the difficulty. Some components add new content and others just improve the original content. Supports BG2 and BG2EE. You can find a detailed description here.
The Tweaks Anthology: Huge compilation of fixes, cosmetic changes, and tweaks. Supports all IE games.
EEUITweaks Mod Collection: Collection of mods that tweak or fix many parts of the UI. Supports BGEE, BG2EE, SoD, PSTEE, and EET.
ATweaks: Adds PnP-based rules alterations, especially in the domain of fiends (demons, devils), fey (dryads, sirines), undead and mephits, giving them cool and dangerous abilities and strong and complex scripting to use them effectively. Supports BG2 and its offshoots (Tutu, etc.), BGEE, BGEE/SOD, BG2EE and IWDEE.
IWDification: Brings some of the elements of Icewind Dale into the Baldur's Gate series. It includes elements like selectable bard songs, two-handed axes, and over 70 new spells. Every component can be installed independently. Supports BG2, Tutu, BGT, BGEE, and BG2EE.
Jimfix: Miscellaneous collection, including notifications about spells, fixes to some spells, and fixes to some Ascension components. It's unclear which games are supported. Probably all in the BG series.
Blazing Inferno: Prevents zero damage hits (like a fireball hitting a spell caster who is immune to fire) from disrupting spell casting.
Lighting Pack: Provides options to adjust brightness, contrast, and other visual parameters. Supports BGEE, SoD, BG2EE and IWDEE.
Ammoless: Fixes an issue with magical ranged weapons with unlimited ammunition. Supports BG2EE 2.3+.
The list is roughly sorted by the scope of the changes each mod makes to the games.
Needless to say, the concept of improvement is subjective, this is a list for mods that are meant to be an improvement, regardless of whether each player thinks that they really improve the games or not.
Please name any fitting mods that are not in this list and let me know of anything I got wrong.