All the following experiments are modifications on the opensource typeface Crimson (testing page)

char-set: a, n, o, b

Non-linear interpolation between two pen-model sterotypes which correspond to the classifications oldstyle and modern in the way the contrast is modulated.

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

Interpolation from a modulated sans-serif design towards a serif book type with large serifs.

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

Interpolation of the top serif angle.

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

Interpolation of the outline and skeleton curvature.

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

Interpolation of the outline and skeleton curvature.

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

Interpolation of the serif curvature.

char-set: H,n,o
Pendant to RobotoFlex, still very limited.

All experiments are modifications upon the opensource typeface Crimson by Sebastian Kosch. (https://github.com/skosch/Crimson)