Bijoy Bayanno alternatives
Enables direct Bangla typing on English keyboard
Free · Open
A cross-platform command-line utility that captures keyboard input, remaps it, and provides configurable mapping options
Key Mapping·Keyboard
Desktop
AlertCaution is advised.

Free · Open
A graphical keyboard that enables typing in Bengali through Romanized transliteration through phonetic and layout-based methods
Keyboard
Desktop
AlertCaution is advised.