Tons of EQ exploits but a couple that were a bit more unique/possibly not known about:
One day I'm doing who knows what when I read some interesting shit on the serverwide shaman channel (thecrucible). I think LoY just launched that day, and someone had found out that a mob in Gukta ("revamped" Grobb) was totally messed up. So I run over there and find the NPC in question: a troll slave in some cage by the bank. Every time you killed this mob, it would give you a ridiculous amount of exp. I think pretty quickly there was a shaman on every single server farming this guy, and a few hours later the servers came down for an emergency patch, which fixed it. Still got quite a bit of AAs over those couple hours. It was so random I had to wonder if that was an accident or not.
A few years later I came back to EQ to play on The Sleeper progression server. I was playing on a laptop at this time and as I was running through Burning Woods I started running at warp speed. We're talking several times faster than Selos. And that wasn't all - my game was actually sped up in relation to the server. I could chain cast nukes like an uzi. I could melee at like 10000% haste. I did some research to try to find out why this was happening, and discovered that it was linked to the power saving feature of my laptop. With this knowledge I was able to turn on "warpspeed" mode whenever I felt like it. However, I never abused this as much as I probably should have since I expected it was probably pretty easy for GMs to figure out and ban me for it. I later find out that a lot of my guildies were warping directly to BoT tower nameds to farm loot and all kinds of other crazy shit without getting banned.
This next one was a lot more known, since a lot of people were using it when it was a thing. I also did this on The Sleeper so it's circa 2007, however I have no idea how long this exploit was in the game. I used it for months on The Sleeper and don't remember it every getting fixed while I was playing. This exploit was pet pulling, and the way it worked was this: when an NPC is aggroed it generally keeps firing off a "shout for help" ability which is what causes passive mobs to aggro on you. However, if a pet conned green TO the mob it attacked (and got initial aggro), the NPC would never shout for help at all while that pet was still alive.
This was especially relevant in Chardok during the progression servers. I grinded Chardok faction so I could run around the zone and then find named mobs pretty easily. I would summon a low level pet, /pet attack the named, /pet back off, and then jump in and start fighting. This allowed me to murder any mob I wanted without anything nearby ever assisting. It was absolutely trivial to pull a mob like King Bathezid to the zone-in. I made a lot of plat early on doing this.
The Sleeper event in Sleeper's Tomb was also really broken back then. Our guild did the standard thing of leaving 1 warder up so we didn't trigger the event and nerf the zone. When we were done with Sleeper's Tomb we killed all 4 warders to experience the event, Kerafyrm spawned and murdered us all as expected. However, a friend of mine ventured back into the zone about a month later and discovered that the warders were still there. From this point on a group of us would secretly farm the warders and sell shit like gnome illusion masks and scepters of destruction for ludicrous amounts of plat. We eventually got so rich there was no point in farming the stuff anymore.
One day I'm doing who knows what when I read some interesting shit on the serverwide shaman channel (thecrucible). I think LoY just launched that day, and someone had found out that a mob in Gukta ("revamped" Grobb) was totally messed up. So I run over there and find the NPC in question: a troll slave in some cage by the bank. Every time you killed this mob, it would give you a ridiculous amount of exp. I think pretty quickly there was a shaman on every single server farming this guy, and a few hours later the servers came down for an emergency patch, which fixed it. Still got quite a bit of AAs over those couple hours. It was so random I had to wonder if that was an accident or not.
A few years later I came back to EQ to play on The Sleeper progression server. I was playing on a laptop at this time and as I was running through Burning Woods I started running at warp speed. We're talking several times faster than Selos. And that wasn't all - my game was actually sped up in relation to the server. I could chain cast nukes like an uzi. I could melee at like 10000% haste. I did some research to try to find out why this was happening, and discovered that it was linked to the power saving feature of my laptop. With this knowledge I was able to turn on "warpspeed" mode whenever I felt like it. However, I never abused this as much as I probably should have since I expected it was probably pretty easy for GMs to figure out and ban me for it. I later find out that a lot of my guildies were warping directly to BoT tower nameds to farm loot and all kinds of other crazy shit without getting banned.
This next one was a lot more known, since a lot of people were using it when it was a thing. I also did this on The Sleeper so it's circa 2007, however I have no idea how long this exploit was in the game. I used it for months on The Sleeper and don't remember it every getting fixed while I was playing. This exploit was pet pulling, and the way it worked was this: when an NPC is aggroed it generally keeps firing off a "shout for help" ability which is what causes passive mobs to aggro on you. However, if a pet conned green TO the mob it attacked (and got initial aggro), the NPC would never shout for help at all while that pet was still alive.
This was especially relevant in Chardok during the progression servers. I grinded Chardok faction so I could run around the zone and then find named mobs pretty easily. I would summon a low level pet, /pet attack the named, /pet back off, and then jump in and start fighting. This allowed me to murder any mob I wanted without anything nearby ever assisting. It was absolutely trivial to pull a mob like King Bathezid to the zone-in. I made a lot of plat early on doing this.
The Sleeper event in Sleeper's Tomb was also really broken back then. Our guild did the standard thing of leaving 1 warder up so we didn't trigger the event and nerf the zone. When we were done with Sleeper's Tomb we killed all 4 warders to experience the event, Kerafyrm spawned and murdered us all as expected. However, a friend of mine ventured back into the zone about a month later and discovered that the warders were still there. From this point on a group of us would secretly farm the warders and sell shit like gnome illusion masks and scepters of destruction for ludicrous amounts of plat. We eventually got so rich there was no point in farming the stuff anymore.