HFDEM is a Hybrid Finite-Discrete Element Method developed and parallelized by Dr Hongyuan Liu at University of Tasmania, Dr Daisuke Fukuda at Hokkaido University Japan and their PhD students as well as collaborators on the basis of the General-Purpose Graphic-Processing-Units (GPGPU) using Compute Unified Device Architecture (CUDA) C/C++. HFDEM provides a powerful numerical tool for investigating the fracture and fragmentation of rocks under static and dynamic loading conditions as well as the instability and collapse of rockmass structures and resultant debris fragmentation and flow process. HFDEM is free to use for the purpose of research and/or verification although the use of the code for military and commercial purposes is prohibited. If interested, please download it.