These are the official conversion LUTs published by the camera manufacturers themselves — the technically correct way to take S-Log, C-Log, N-Log, V-Log, D-Log and Log-C footage back to a Rec.709 starting point before you grade. Always start from the official LUT, then build your look on top.
The official manufacturer LUT is a technically accurate log-to-Rec709 transform. It gives you correct color and contrast as a neutral base, which you then grade on top of.
Yes. Sony, Canon, Nikon, Panasonic, DJI, RED, ARRI and Fujifilm all publish their conversion LUTs for free.
Pick the one that matches your camera brand and its log format — for example S-Log3 for Sony, C-Log for Canon, or V-Log for Panasonic.