• Canon Hack Development Kit
  "CHDK enhances the capabilities of your camera in a non-destructive, non-permanent way. ... It is likely that any Canon Powershot based on the DIGIC II, DIGIC III or DIGIC 4 platforms can be supported." (Site offers a long list of currently-supported cameras.)
  in Computers & Electronics with cameras customization firmware linux projects by 12 users
• Magic Lantern
  "an enhancement atop of Canon's firmware that makes your 5D Mark II into the 5D Mark Free. …It is an open (GPL) framework for developing extensions to the official software, tailored for film making needs. It does not replace the existing firmware, but instead runs along side of it."
  in Computers & Electronics with cameras customization firmware projects by 2 users
• Pentax/Samsung DSLR Firmware Hack Project
  Firmware customization project in an early stage. As of November 2010, they had acquired the firmware for each camera and managed to decrypt it.
  in Computers & Electronics with cameras customization firmware projects by 2 users

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