Alpha WoW 0.5.3
This one is more advanced than the familiar sandboxes.
It has spawns, has spells and talents implemented and working quests
The same alpha with the old Ironforge and the old witch looking female trolls
It has way different talent system and respawn system.

Client Launch via WoWClient.exe
The game is poorly optimized and you may have low fps

How to create an account?-you can simply make it up as you login into the realm
Next time you login with the same info your chars will be there
If on login says can't connect etc click on change realms and select the realm

Alpha 0.5.3 Repack
WoW Alpha 0.5.3 Client
discord
source
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SPP Classics V2 (Playerbots) VANILLA/TBC/WOTLK by SPP team
Cmangos Vanilla/TBC/Wotlk
Cmangos all 3

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Vanilla 1.12.1 Repacks Collection

ShadowCore repack with bots
Brotalnia Cmangos:
Winkdogs Vanilla
Trinity Core for vanilla
Easy Pre TBC(FUN)
1.12x Server
Mangos Old
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The Burning Crusade (TBC) 2.4.3 Repacks Collection

Sunstrider repack
Hellground server
Black Monarch repack
Winkdogs(Cmangos)
Hellfire server:
Arcemu
Fury's Eluna:
Oregon Core
Rap WoW
Samitbots(tc)
Easy TBC Repack
Cmangos
MRBXnet(ArcEmu)
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Wrath of the lich king (Wotlk) 3.3.5a Repacks Collection

Phoenix SPP (Azeroth core bots)
Azeroth Core(Playerbots)
SPP TCR2 by Conan&SPP team (Player&NPC bots)
Naaru's Blizzlike Repack
Trinity Core
AC Web Azeroth Core
Azeroth Core repack
Winkdogs(Cmangos)
SPP3 Cmangos(not part of SPP)
Beautiful mind repack(arcemu)
ArcEmu Wotlk
SF Reborn
Easy WOTLK
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Cataclysm (Cata) 4.3.4 Repacks Collection

Preservation Project
Olympus Core
Unnofficial Cata Repack
Mangos Cataclysm
Fury's Cata Repack
emu cata repack
MMOPRO's repack
Firelands Repack
WoWCreador Cata (extract pw-www.wowcreador.com)
Emucoach free version

For the most part Cataclysm doesn't need patching. You can simply download the cata client from any server and modify the realmlist
Just in any case you are unable to connect specifically the MMO-pro repack you can extract this wow.exe in your game folder
4.3.4 Patched
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Mists of Pandaria (MOP) 5.4.8 Repacks Collection

Project SkyFire
Jade Core Repack
NPC Bot(bad)
Junky Bulgaria
Tree Repack
Torghast Project
Legend of Azeroth
MOP Tandra Repack
_repack
Emucoach (Free version)
Yekta Core (OLD)

Some repacks like Jade Core, Junky Bulgaria and npc bot(bad) repack use 5.4.7 executable to play
Simply extract the 5.4.7 executable in your game client folder
5.4.7 Patched