Anjal keyboards
Anjal is the name given to a Tamil input method developed by Muthu Nedumaran in 1993 — well before other input methods that transliterate English keystrokes to Indic scripts came into existence. It was included in Murasu Anjal, a software package with other utilities for Tamil text manipulation and conversion. A free version was distributed over the web, and that let hundreds of thousands of people write Tamil using a qwerty keyboard.
Anjal was included in Mac OS X 10.4 (Tiger) in 2004.
Using the same approach, Anjal-style input methods were written for Malayalam, Telugu, Kannada, Devanagari and Gurmukhi, for an app called IndicNotes by the same author. Those input methods have since been reworked for ease of use and performance.
Which keyboards are Anjal
Sangam includes Anjal-style keyboards for Kannada, Malayalam, Tamil and Telugu. On your device they appear alongside the native-script keyboards, named with Anjal (qwerty) — so Kannada offers both “Kannada” and “Kannada Anjal (qwerty)”. Anjal for the other languages will be added in future versions.
Every other language uses a native-script keyboard.
The keymaps
Each script’s page lists what each keystroke produces:
The Devanagari and Gurmukhi pages document those scripts’ keymaps too, from the same lineage.