As far as I know, not all countries celebrate their mother tongue day. In 1952, a few brave hearts fought for the existence of our own Bengali nationalism. Mostafa Jabbar Sir Bangla-developed software that helped people around the world know that there is a language called Bangla, which has a great history behind it, and today people are excited and interested, the International Day of Mother Tongue celebration. Bijoy Bayanno was a Bengali updated software developed by Sir Mostafa Jabbar in the memory of the tongue movement in 1952 version. This type of software is not only for us but also for the people around the world write Bengali very useful.
For more details and free download
Bijoy xp/7/8 and Mac (Note: It's my other blog)