[nsxwolf]

And there's file system stuff: https://stackoverflow.com/questions/28640159/what-is-the-dif...

[tyingq]

Ah, yep. The original nosql. Variable and fixed length record based storage, that comes with the OS.

[p_l]

The parts that are standardised in COBOL (k/v storage) are implemented in GNU COBOL using gdbm/Berkeley DB.