This is a boilded down version of my Serum system (example). It's a 2D particle system and there's no GLSL involved! Feel free to play around and be inspired. Always credit me when sharing results. Non-commercial use only, contact me otherwise.
Hi! Here is .tox file with water ripple effect made with GLSL. Code is based on this shader, but I did some changes and leave a comments for you. You can also read theory behind algorithm here.