"Magic Lantern - Free Software on Your Camera".
Firmware and source code is released under the GNU General Public License.Originally developed for DSLR filmmaking, Magic Lantern's features have expanded to also include those for still photography. Later mirrorless cameras are not supported because they use a codebase similar to Canon PowerShot cameras rather than Canon EOS cameras therefore CHDK ports are planned.
As of August 2017 support for the Canon EOS 5D, 5D Mk III, 6D, 7D, 60Da, 650D, 700D, and 1100D DSLRs and the mirror-less EOS M had also been added. Starting in September 2010, a person using the name "A1ex" on the CHDK (Canon Hack Development Kit) website forum and other people ported Magic Lantern to the Canon EOS 50D, 60D, 500D and 600D.
He ported it to the Canon EOS 550D in July 2010.
If you want to read up on all of the version 2 specifics, you can click here to read the entire press release, or head over to the update’s landing page for a more graphically pleasing feature overview.Magic Lantern firmware was originally written for the Canon EOS 5D Mark II by Trammell Hudson in 2009 after he reverse engineered its firmware.
The update goes live for 7D owners in early August at no extra charge, and will be available for download at the Canon U.S.A.
The main improvements to the ultra-rugged camera coming in firmware v2 include: an extended RAW buffer of 25 images (or 130 for JPEG), in-camera image editing and rating system, the ability to limit maximum ISO when shooting in Auto ISO mode, a digital wind-cut filter to eliminate peripheral noise when shooting video, support for the GP-E2 GPS receiver and - possibly the most requested feature - manual audio control in video recording. Not surprisingly, the rumors seem to have been spot on, as firmware v2 for the 7D brings many of the highly-anticipated and frequently-requested features that users of Canon’s flagship APS-C SLR have been pining for. Earlier this month we reported on rumors of a significant Canon EOS 7D firmware update that was possibly in the works, and today that update became official.