Different weights of UbuntuTitle typeface - from bold to skinny, with latin and eastern europe accents.
The typefaces are available as .ttf, .otf, and .svg-font files, as well as Fontforge .sfd and their drawing Inkscape sketches in .svg format, all sources needed for helping people improving it.
The process of opening Inkscape drawings from Fontforge were similar as explained at http://ospublish.constantvzw.org/?p=340#more-340
These different stroke weights were done using the square root relation from the original one (the same as used on DIN-A/B/C paper sizes, for example), also used on Univers typeface from Adrian Frutiger at 60's, and also from other typeface authors that time.
Comments are very welcome! :-)