TeX Gyre Heros is based on URW Nimbus Sans L, kindly released by URW++ Design and Development Inc. under GFL. The Vietnamese glyphs were added by Han The Thanh. Remus Variable combines the static styles of TeX Gyre Heros into a single file with axes for weight, width, and slant.
URW Nimbus Sans L is based on Helvetica, designed by Max Miedinger with Eduard Hoffmann at the Haas Type Foundry in 1957. Helvetica became one of the most widely used sans-serif typefaces in the world, valued for its neutrality and breadth of weights.
Remus Variable is released under the GUST Font License. You may use, study, modify, and redistribute this font freely, including in commercial work. Derived fonts must be released under the same license and must be renamed to avoid confusion with the original.