The "Libre Barcode" series is the gold standard for free use. It includes Code 39, Code 128, and EAN-13. It is open-source and highly compatible with Windows environments.
Search for "Barcode Font" to find community-driven OpenType and TrueType files that are completely unrestricted for commercial use. Popular Free Barcode Types crystal report barcode font free download
More compact and supports the full ASCII character set. It is more complex because it requires a "checksum" calculation to be readable. The "Libre Barcode" series is the gold standard for free use