In aerospace and packaging machinery, structural components often contain deep holes and cavities that require cutting tools with high length-to-diameter ratios during machining. However, the stiffness of these tools decreases significantly with the increase in length-to-diameter ratio, leading to frequent cutting chatter that severely limits machining efficiency and accuracy. Passive vibration suppression technologies, characterized by their effectiveness and simplicity in implementation, have demonstrated great potential in improving the stiffness/damping characteristics of long overhang tools. These technologies mainly operate via energy dissipation and dynamic vibration absorption mechanisms. Recent research progress in long overhang tool design for turning, milling and boring operations is systematically reviewed, covering both domestic and international developments. With ongoing advancements in structural design and materials science, future research directions may focus on theoretical innovations, structural optimization, development of novel damping materials, and exploration of new vibration suppression principles.