Examples of websites using
GT Zirkon
(GT Zirkon is a geometric sans-serif font released by Grilli Type. The family consists of 18 styles, including regular, book, bold, condensed, and extended widths, each with matching italics)
with
GT Eesti
(GT Eesti is a serif font designed by Reto Moser and released by Grilli Type. The design features a modern interpretation of the classic Estonian newspaper fonts. The family is available in three styles (text, display, and monospaced) with five weights and matching italics in each style)