Zawgyi One is a non-standard Burmese font but it helped Myanmar internet users for over 10 years with writing and reading on The evolution of Pyidaungsu Myanmar Unicode font It was hard to replace this font due to it's user experience and ease of install and use.
This is a non-standard Myanmar Unicode font but it was widely used for over a decade.
This was the standard Myanmar font for a period of time but Pyidaungsu font is it's successor.