For Windows 7–10 or Mac OS X 10.10–macOS 10.15 Catalina To run on macOS for the first time, Ctrl+click, choose Open, then confirm.
DTL OTMaster is a technical OpenType font editor developed by Dutch Type Library and URW Type Foundry. With OTMaster, you can inspect, troubleshoot and modify OpenType and TrueType fonts in a non-invasive way — in all their flavors, including variable fonts, color fonts, TTC collections, WOFF2 web fonts and CID-keyed OTF fonts. OTMaster is a perfect companion app for FontLab VI: draw, space, kern & hint in FontLab, test & tweak in OTMaster. Learn more about DTL OTMaster, and try FontLab VI, our modern pro font editor.