The font is derived from the Sampige font developed at IISc. Sampige is a beautiful typeface, yet has incomplete Opentype tables. The tables have been entirely newly created and few new glyphs added for completeness.
Additionally, Goda supports Vedic symbols required for Taittiriya and Sama Veda. Details are available in the IME manual and the font document.
Goda borrows Basic-Latin block (0x00-0x7f) glyphs from the Doulos SIL font.
Goda is usable with all Opentype-aware applications like notepad, wordpad, MS office, SSOffice, Libreoffice, Openoffice, IE, Firefox, and Chrome.
GodaGr implements the same features as Goda using Graphite "smart font" technology instead of Microsoft's Opentype tables. In addition, there is also support for Samaveda svara markings (not available in Goda).
GodaGr is usable with Graphite-aware applications like Libreoffice and Openoffice.
Goda and GodaGr are totally identical/compatible, except for the Samaveda svara-s.
MS Windows did not support positioning of Taittiriya svara-s on non-Unicode Scripts till ver 8.1. Ver 8.1 does. The font has both proprietary and Unicode svara-s for use on Windows Ver < 8.1 and >=8.1 resp. BhashaIME automatically recognizes the ver of OS and uses the appropriate.
Both the fonts have been used to render the entire samhita and padapatha texts of Taittiriya-samhita.