The reference font for SMuFL is Bravura, which can be downloaded from GitHub. Bravura is provided in OpenType, WOFF, WOFF2 and SVG formats, and is released under the SIL Open Font License. The example glyphs in this specification are all taken from Bravura.
Other SMuFL-compliant fonts are available under a variety of licenses. A list of such fonts can be found here.
Support for SMuFL-compliant fonts has been implemented by a variety of applications. A list of applications that support SMuFL can be found here.