Freemix is a group of useful free scripts for Glyphs. This pack includes the following scripts: Delete all hints, Expand Kerning, Insert Glyph to Background, Insert Glyph, Mask to Master, Paste Background, Remove Backup Layers, Symmetrify, Round Kerning.
Show Stems shows a measure line with distances between outlines. When distances match the value saved metrics in the Glyphs Palette, it will highlight in green and tell you which one it matches. Its position is attached to the measurement line.
Bubble Kern is based on the shape of surrounding outlines you draw, which is considered a bubble. BubbleKern automatically kerns the typeface using this bubbles. This is a learning tool to help you understand kerning concept and to improve and make easier the kerning process.
This plugin superimposes the current shown glyph as a rotated copy of it self depending on the value you set in the transformation rotation field. It can be pretty helpful when you are working on symmetric characters, it can help you to balance letters.