The goal is to make Gladdy highly configurable in it's appearance. Everything can be arranged left or right independently. Also I gave Gladdy a new look with black borders. A lot can be configured.

Modules:

Announcement (drink, trinket usage, spec detection ...)
ArenaCountDown
Auras (show important (de)buffs as well as interrupts on the class icon)
BuffsDebuffs (show buffs and debuffs on arena frames - can be filtered)
CastBar (shows a castbar, can be disabled)
ClassIcon (or specicon, once detected)
Clicks (bind spells or macros to click actions)
CombatIndicator (shows a sword icon if unit is in combat)
Cooldown (tracks important cooldowns)
Diminishing (tracks DRs)
ExportImport (share your profile with your friends in the form of a string, which can be imported)
Highlight (highlights focus and target)
Pets (show arena pets)
Racial (show arena racial cooldowns)
Range Check (checks the range to a unit by a configurable spell)
Shadowsight Timer (shows a little movable frame with time left until Shadow Eyes spawn)
TotemPlates (show totem icons instead of normal nameplates, compatible with Plater, NeatPlates, KUI, ThreatPlates, ElvUI, TukUI)
Trinket (tracks trinket usage)
VersionCheck (checks if you use an older version that your teammate)
XiconProfiles (predefined profiles to start your configuration from)

Valid Slash commands

/gladdy ui (shows config)
/gladdy test (standard 3v3 test mode)
/gladdy test1 to /gladdy test5 (test mode with 1-5 frames active)
/gladdy hide (hides the frames)
/gladdy reset (resets current profile to default settings)

Screenshots

Contributors

Thank you!

Special Thanks

miraage - the origininal author of Gladdy! Your work set the foundation for this edit. Thanks!
Schaka - the maintainer of Gladdy! (thanks for letting me continue Gladdy and all the work you put into the TBC community)
Macumba (thanks for all the support, your feedback and your dedication for the TBC community)
RMO (without you I would not have modified Gladdy at all and thanks for all the suggestions and active feedback)
Ur0b0r0s aka DrainTheLock (thanks for testing, giving feedback and correcting/adding wrong CDs)
Klimp (thanks for all the suggestions and active feedback)
the whole TBC addons 2.4.3 discord (thanks for the support and great community, especially the MVPs)
Hydra (thanks for constructive feedback and suggestions)
Xyz (thanks for suggestions)

Changes

v2.00-Release

This is a packed release with new features and bugfixes. Most importantly, positioning of all elements has been redone with movable frames. Thank you for the great feedback and active contribution.

Here is a list of all changes:

major release version set to v2
- this will mean, that export strings will still be backwards compatible, but not forward (v2 String cant be imported into v1 Strings but vice versa)
big overhaul of positioning elements added! All elements besides HP and PowerBar can be moved separately
- added Mover Frames for Auras, Interrupts, (De)Buffs, CastBar, ClassIcon, CombatIndicator, Cooldowns, DRs, Pets, Racial, Trinket
- this will hopefully make configuration a lot easier
SpecDetection:
- fixed spec detection for Paladins
- added following spells for better spec detection:
  - Expose Weakness (Survival Hunter)
  - Slow (Arcane Mage)
  - Improved Blink (Fire Mage)
  - Vindication (Retribution Paladin)
  - Holy Shield (Protection Paladin)
  - Vampiric Embrace (Shadow Priest)
  - Blade Flurry (Combat Rogue)
  - Unleashed Rage (Enhancement Shaman)
  - Flurry (Enhancement Shaman)
  - Shamanistic Rage (Enhancement Shaman)
  - Healing Way (Restoration Shaman)
  - Totem of Wrath (Elemental Shaman)
  - Dark Pact (Affliction Warlock)
  - Conflagate (Destruction Warlock)
  - Shield Slam (Protection Warrior)
Cooldowns:
- added Fear Ward and Fear Ward Cooldown Detection in case it was used before arena
- added following cooldowns:
  - Scare Beast (Hunter)
  - Feign Death (Hunter)
  - Viper Sting (Hunter)
  - Flare (Hunter)
  - Fear Ward (Priest)
  - Shadow Word: Death (Priest)
  - Evocation (Mage)
  - Grounding Totem (Shaman)
  - Spell Lock (Warlock)
  - Devour Magic (Warlock)
  - Intercept (Warrior)
Auras/Interrupts:
- can now be detached from ClassIcon and positioned/scaled anywhere separately
- added Auras:
  - Scare Beast (Hunter)
  - Fear Ward (Priest)
Shadowsight:
- reset timer when buff was taken
- add a configurable 2nd timer or show one timer with the closest CD
fixed some DR-categories (Hibernate / Chastice / Dragonsbreath / ImpConcussiveShot / Counterattack)
Pixel Perfect option added (makes your Gladdy Frames pixel perfect - no more wierd scaling interferences)
Pets can be grouped (not perfect yet, but a first step)
added DR-Level Text (thanks https://github.com/ManneN1)
added zhCN Locale (thanks https://github.com/veiz)
ClassIcon can be disabled
add interrupt announcement
detect SpellLock and Devour Magic cooldowns properly
minor fixes:
- fixed reloading during arena to properly show all frames
- fix grow up positioning

v1.22-Release

fixed import for some localizations not working
added cooldown number alpha configurations for Auras, BuffsDebuffs, Cooldowns, Diminishings, Racial & Trinket
grounding totem effect fix
fixed some buffs/debuffs not being present in BuffsDebuffs

v1.21-Release

fixed error when hiding blizzard frames ArenaEnemyFrames related to ElvUI
added Pummel cooldown

v1.20-Release

configurable DR duration
scale in 0.01 percent steps
added Net-o-Matic, Nigh Invulnerablility Shield, Nigh Invulnerablility Backfire & Flee (Skull of Impending Doom) to Auras
added Mangle, Chastise, Avenging Wrath, Rapid Fire to BuffsDebuffs
improved testmode to only activate Auras/Buffs/Debuffs/Dr's that are actually enabled
added Mir's profile to XiconProfiles
added zhTW localization
added buttons for Test, Hide & Reload in the config
added version in config
ArenaCountdown upgrade
Repentance, Freezing Trap & Wyvern Sting are now disorients
import string now ignores errors on deleted options
added (un)checkAll button in DR-Categories in Diminishing Module
totemplates fix option to alter all colors/alphas
hide blizzard arena pets as well
fix shadowsight timer showing when not in arena or testmode
some minor refactoring / optimization

v1.19-Beta

fix gladdy frames not showing v2
minor bug fixes

v1.18-Beta

castbar font now working properly

v1.17-Beta

option TimerFormat added (seconds or seconds + milliseconds) (General > Cooldown General > Timer Format)
hide blizzard arena frames without cvars
fix Gladdy bugging out on arena join when in combat
fix some TotemPlates issues
fix Feign Death causing to reset DR and Aura tracking
ArenaX option in Healthbar module now only shows the number
add background for all frames (General > Frame General > Background Color)
add evasion and banish to Aura
add MSBT to Announcement module
Shadowsight timer can be locked now
add "All" modifier to Clicks module
updated testmode for BuffsDebuffs (show only from enabled set)
updated Klimp's profile
added a new Profile in XiconProfiles -> Rukk1

v1.16-Beta

unit gray in stealth when rangecheck module disabled

v1.15-Beta

hotfix added entangling roots nature's grasp

v1.14-Beta

hotfix for secure button grow direction up

v1.13-Beta

frames behave now to mouseover macros
added Range Check module (configurable which spell is used for range check)
added Shadowsight Timer module (with announce)
added Clicks module
added Interrupt Tracker in Aura module (border color by spell school locked)
TotemPlates compatible with Plater, NeatPlates, KUI, ThreatPlates, ElvUI, TukUI
added a new Classic Profile in XiconProfiles
hide blizzard arena frames option added in General
castbar enable/disable
powerbar enable/disable
added some auras (Blackout, Improved Hamstring, Mace Stun, Stormherald Stun, Shadowsight Buff)
added Swiftmend and Berserker Rage cooldowns
changed textures for Mace Stun, Charge Stun and Intercept Stun
reduced BLP size by 80%
show XiconProfiles on first login
DR bigger icons possible
minor fixes

v1.12-Beta

fix classic profile

v1.11-Beta

TotemPlates fix after blizzard update

v1.10-Beta

fix german and russian client not working
ArenaCountdown loacalization now working for all languages (except itIT...beta has no option to select italian)
Race and Class localization working for all languages
Localization finished for German

v1.09-Beta

fix Blizzard profile not having all modules preconfigured

v1.08-Beta

fix Buffs not showing on class icon
added option highlight to be inside
added option to grow frames vertically
added new profile to XiconProfile (Blizzard raid style)
minor bugfixes

v1.07-Beta

CombatIndicator module added
spec icon option added to Classicon module
arena1-5 for name option added
add a couple buffs to LibClassAuras
add blessing of sacrifice and intervene to auras
general options updated to apply font/borders/etc for all frames
XiconProfiles updated
/gladdy test1-5 now possible
fix PowerBar text updates
click through frames exept health/power bar
add mask texture for icons

v1.06-Beta

fixed BuffsDebuff module
fix racial texture reset
minor bugfixes

v1.0.5-Beta

fixed Aura-Module
Racial module added to EventListener and Version check updated
constants for auras/cooldowns/racials updated
anchoring for modules rewritten
fix Aura module options (localization independent for profile export)
Power-/HealthBar customize texts added and UNIT_DESTROYED added
Racial module added and trinket modified
XiconProfiles import strings
Pets position extended
delete unused saved variables
ExportImport, VersionCheck & XiconProfiles fix
TotemPlates add option to show friendly/enemy icons

v1.0.4-Beta

XiconProfiles fixed

v1.0.0-Beta

port form 2.4.3