Making Libre Graphics Magazine

another parametric design tool

Also of interest:

prototypo

A parameter-based font generator.
License: GNU Affero General Public License
Infos: http://www.prototypo.io/
Source: https://github.com/byte-foundry/prototypo

opentype.js

A JavaScript parser for TrueType and OpenType fonts.
A canvas library for displaying fonts.
License: MIT License
Infos: http://nodebox.github.io/opentype.js/
Source: https://github.com/nodebox/opentype.js

and one of the revelations from LGM14:

Metapolator

A web-based parametric font editor.
License: GNU GPL v3
Infos: http://metapolator.com/
Source: https://github.com/metapolator/metapolator