FontShepherd is an OpenType font table editor/viewer, inspired by the Mensis tool, developed in the early 2000s by George Williams as a companion to his FontForge editor, but finally abandoned in favour of the later. Yet I always used to find Mensis a convenient tool to have a queek look at a font file internals, even when it was already outdated. So here's my attempt to implement a similar idea in a modern environemnt. FontShepherd uses the same internal representation model of Bezier splines as Mensis and FontForge did, so it shares a lot of source code and algorithms with FontForge, especially in those parts of code which are related with spline analysis and modification.
When you open an OpenType font in FontShepherd, you can see a list of "tables" (as the OpenType spec call them), present in the file. You can delete tables or copy-paste them from one font to another, although it is not recommended to do so, unless you know what are you doing. Double click on some tables will invoke a specific editing window, where you can modify most or all of their parameters. The following tables are currently supported for viewing or editing: 'head', 'hhea', 'vhea', 'cmap', 'name', 'OS/2', 'post', 'CPAL', 'CFF ', 'CFF2', 'glyf' and 'SVG '. Currently there is no documentation: you may refer directly to Microsoft or Apple docs for the meaning of any particular table fields.
Of course the most complex case is editing the tables where the glyph outlines themselves directly reside, i. e. 'CFF ', 'CFF2', 'glyf' or 'SVG '. Clicking on any of the listed tables will invoke a font view window, where all available glyphs are displayed. It is possible to order them either by GID or by any of the encodings stored in the font 'cmap' table. It is possible to edit or add glyphs and save changes. The following limitations should be currently taken in account:
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there is no support yet for TTF instructions: they are dropped for modified glyphs and ignored otherwise;
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you can view and save the contents of a 'CFF2' table as well as convert it to 'CFF ' or vice versa, but variable font data, present in the table, aren't preserved;
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SVG support is currently limited: in particular, groups aren't preserved, while their properties and transformations are simply applied to underlying graphical objects. However, FontShepherd attempts to preserve without changes those glyphs, which haven't explicitly been modified by user.
As you can see FontShepherd is still in the beta stage, so use it at you own risk and backup your data. Nevertheless I hope it can be useful even if its present form, at least as a viewer if not as an editor.
See LICENSE