The SIM-GONG is a synthesiser plugin designed to make gong-like sounds without using samples. Whilst it may lack great authenticity is has a very flexible engine to cover several types of gong as well as “alternative” sounds.
Click on the picture to download the zip which contains 32 and 64 bit plugins as well as a 32 bit plugin for XP systems. You also get the FlowStone schematic which you can open in FlowStone to inspect and make use of whatever you like, and a User Guide and background info.
Now you can crash out!