Some popular QR-code font and encoder suites include:

On his screen sat the "Nebula Matrix"—a proprietary QR-encoder suite that cost more than his car. It didn’t just generate codes; it used a custom, "un-hackable" font-based encryption layer that nested data within the pixel-geometry of the squares themselves. It was the gold standard for high-security logistics. And Elias needed in.

"Just a font," he whispered, cracking a knuckle. "It's just glyphs and math."

An open-source, Java-based library supporting QR code generation and decoding. Available under Apache License 2.0.