It still isn't as "pretty" as Google Input Tools, but for accuracy and speed in standard Kannada typing exams and official work, Nudi 6.0 is the definitive standard.
If you have ever tried to type in Kannada on a standard QWERTY keyboard, you know the struggle. For years, has been the silent workhorse behind government documents, newspapers, and academic papers in Karnataka. nudi 6.0
[Link to Karnataka Govt Portal / C-DAC]