for documents
- Myriad Pro https://fonts.adobe.com/fonts/myriad
for slides
- Optima (Linotype) https://www.fonts.com/font/linotype/optima
for GUIs
- acz-9×15-sans: my own creation (OpenType), based on misc-fixed https://en.wikipedia.org/wiki/Fixed_(typeface), but not monospaced. Looks best without aliasing (“smooth edges of screen fonts” on Windows).