With the widespread deployment of the Internet of Things (IoT) and distributed sensing networks in marine and industrial environments, energy harvesting based on Flow-Induced Vibration (FIV) has garnered significant attention due to its high energy density and environmental adaptability. This paper provides a comprehensive review of the evolution of FIV energy harvesting systems, with a particular focus on absorber-based configurations. First, the classification of existing systems is systematically outlined, and the theoretical foundations of the classic linear Tuned Mass Damper (TMD) are revisited. The review critically analyzes the inherent limitations of linear theories, specifically fre... More >