Why not sqlite? You can read/write to a sqlite file in pretty much any language using decent bindings aside from maybe browser JS. I've worked with third party

Why not sqlite? You can read/write to a sqlite file in pretty much any language using decent bindings aside from maybe browser JS. I've worked with third party sqlite files several times and it usually isn't that bad. You can't just use any text editor to work with them, but the sqlite CLI is very easy to install and use. If you want a GUI, DB Browser seems to work very well.