Apps similar to make-font-bolder include Microsoft Typography, which is free. Other options are AFDKO, Private Character Editor and Apple Font Tool Suite. In total there are four Font Editors like make-font-bolder for Windows, Mac and Linux.
Internal tools developed at Microsoft for manipulating and creating OpenType and TrueType font files. Used in development of new font toolsets and fonts. The tools includes TTFdump, TrueType Open Assembler, Flint, SBIT32, CacheTT, FastFont, and AddTable.
AFDKO is a collection of command-line tools used at Adobe for manipulating and creating OpenType font files. Can verify structures, and table entries and their checksums.
(Windows built-in) Using Private Character Editor (PCE), you can create up to 6,400 unique characters (such as special letters and logos) for use in your font library. PCE contains basic tools for creating and editing characters, along with more advanced options.
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A suite of tools for working with font files. The tools focus on comparing, manipulating, and validating font files that are to be shipped for Apple’s operating systems. Graphical tools includes Blinker, Font Proofer X, and MorxTester.
