>>558
A:
Alang: An algorithmic language with recursive descent parser and tree-walk interpreter/bytecode stack virtual machine(in separate branches)
https://github.com/iamsubhranil/Alang

ALang: Another programming language
https://github.com/StiventoUser/ALang

ALang: Yet Another Programming Language
https://github.com/regmi007/ALang

O:
The O Language: The O Language is an esoteric programming language used for code-golf.
https://o.readthedocs.io/en/latest/

世界初がなんだって？