By now, you've probably heard about CHDK for Canon point and shoots and Magic Lantern for select DSLRs, but plenty of other firmware exists to supercharge other cameras. DIY Photography put together a comprehensive list of them all.
This list includes custom firmware for Canon, Nikon and Panasonic cameras. While you won't find options for every model, many popular ones are covered. Check out the list and add tons of awesome new features to your camera.
The Ultimate Custom Firmware For Any Camera Roundup [DIY Photography]