Metaflop is an easy to use free and open source web application for modulating your own fonts. Metaflop uses METAFONT, which allows you to easily customize a font within the given parameters and generate a large range of font families with very little effort.
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The source code of this project and the METAFONTs are licensed under the GNU General Public License v3.0 (GPL). This means you can use and extend the source code, as long as you distribute the source code freely under the same license. This license also allows for commercial use.