Riddick Bowe. He had a great jab but liked to brawl as well. Even when he was completely shot in the 2nd Golata fight his jab kept him in the fight.
Quartey imo was more of a boxer puncher. In his biggest fights, he played the waiting game more than he did the role of the aggressor. But he did have a great jab.
George Foreman. Especially the older version, who was able to batter guys with his slow but strong jabs.
Kovalev of course. IMO the hardest puncher P4P ever. Jermain Taylor had the best jab in the sport in his peak days and knocked at least one opponent with it from what I recall.
Naoya Inoue. Watch his jab against Donaire. Consistent, powerful shotgun jab used to push Donaire back, split his guard open and set him up for power shots. It's a brilliant jab.
I am not the ultimate Mike Tyson fan but I have to say I was always impressed how many jabs he was able to land being so short, with that type of range disadvantage. He had a fantastic jab.