Martel is often a libre font improvement challenge. Started in 2008 inside the Section of Typography & Graphic Communication at the University of Reading, the first weights of the font family (Martel UltraLight, Light, Regular, DemiBold, Bold, ExtraBold and Heavy) were released in 2014. The Devanagari glyphs to-date have all been designed by Dan Reynolds, whereas the Latin script’s glyphs are based on the Merriweather fonts.
Check out the Martel Sans challenge, too.
The Martel Devanagari typeface is designed for typesetting immersive-style documents. It may be be used to set long passages of text in languages that are written from the Devanagari script, including Hindi, Marathi, Nepali, Sanskrit, etc. Martel Devanagari is usually a readable typeface whose glyph proportions are inspired by traditional writing and calligraphic styles. Its high-contrast strokes have a diagonal axis, in keeping with the pen-angle most often used for the Devanagari writing system.