French cleat system for organizing tools

You can find a million videos on YouTube about the French cleat tool-holder system.

• Long before they were used for tool walls, French cleats were used to hang heavy cabinets. And they're best-suited to hanging really heavy things on walls.
• French cleats are the go-to solution for hanging heavy artwork.
• There are newer metal versions [2] [3] of French cleats for artwork and such.
  • Ones that claim a high load rating: [1] [2]
• An alternative:   April Wilkerson's "Slat 45" system.
  • More: [1] [2] [3]