https://www.magiclantern.fm/

https://builds.magiclantern.fm/

Supported cameras:
5D Mark II, 5D Mark III, 6D, 7D, 50D, 60D, 500D/T1i, 550D/T2i, 600D/T3i, 650D/T4i, 700D/T5i, 1100D/T3, EOS M.

Example features:

• Zebras for under/over exposed areas.
• Focus peaking for quickly checking focus.
• Magic Zoom window to fine-tune focus.
• Cropmark overlays for 16×9 bars or any custom shape.
• Overlay a ghost image in live view.
• Spotmeter in live view.
• False color for precise exposure control.
• RGB histogram with RAW support.
• Waveform for perfect green screen lighting.
• Vectorscope for color tones.
• Kelvin and push-button white balance.
• Auto ETTR (Expose To The Right).
• Exposure Lock for manual mode.
• Manually override exposure settings in LiveView.
• Quickly switch between two exposure presets.
• Toggle exposure simulation on/off (Liveview).
• Dynamic range improvements (Dual ISO, other features being researched).
• Bracketing for exposure, flash, or depth-of-field.
• In-camera intervalometer.
• Custom bulb timer for extra-long exposures.
• Motion detection.
• Silent pictures without shutter actuation.
• Record voice tags for photos / videos.
• Analog / digital gain adjustments.
• Selectable input source.
• Toggle wind filter.
• Live audio monitoring through with headphones.
• Beep / test tones.