Free Sans Oblique, from the Free Software Foundation, is a free oblique sans serif with the plain, workmanlike feel of early digital neo-grotesques. The letters lean with a steady forward motion, while the broad curves and open shapes keep the tone neutral rather than flashy.
It fits naturally in interface labels, app mockups, technical documents, presentation headings, and website navigation, where that simple slant brings a little movement without turning decorative. As a free font, it also works for cover lines, title cards, and short pull quotes, especially when you want straightforward sans serif shapes with just enough angle to separate emphasis from the regular style.