afdko
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Adobe Font Development Kit for OpenType (AFDKO) Overview
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OpenType Feature File Specification
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Guide to Variable Features
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MakeOTF User Guide
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Command Line How-To
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CID-keyed UFO Guide
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Issues with OpenType/CFF and TrueType fonts in MS Font Validator
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Practical issues in weight setting and style linking (Windows only)
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A few notes on otfautohint
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FDK Build Notes
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MakeOTFEXE Feature File Parser Notes
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Support of CFF2 in AFDKO
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C/C++ Architectural Changes (v5.0)
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Deprecation System Implementation (v5.0)