Various variable typeface experiments, including sources

Preview/test with sliders of the variable fonts: Variable Font Testing (external, based on axis-praxis.org)

RobotoFlex

https://github.com/Manuel87/RobotoFlex (latest)

CrimVarious

https://github.com/Manuel87/CrimVarious
Based on Crimson by Sebastian Kosch. (https://github.com/skosch/Crimson)

Pen Model (Oldstyle——Modern)

char-set: a, n, o, b

Serif Length (Sans——Serif)

char-set: E, l, d, n, o, p, i, r, t, e

Serif Spur Angle

char-set: E, l, d, i, n, a, r, p

Curvature > Broken

char-set: E, l, a, n, o, b

Curvature > Wiggle

char-set: E, n, l, o, e, t, b, a, r

Curvature > Serif (Concave——Convex)

char-set: E, l, o, d, i, n, p, r, t

Flex

char-set: H,n,o

Variable Icons for an extensive list of formal variables

• full list: http://manuel.vongebhardi.de/theory/typedesign-framework/
• (repository: https://github.com/Manuel87/TypedesignFramework)

Credits

These projects were partially funded by Google Fonts.

Related

• https://github.com/Manuel87/VariableFonts-RepositoryOverview