I've heard of it. I played around with it just long enough to see that it has a steep learning curve. I decided to not spend a lot of time trying to learn it until I saw that I really needed to use it.
I don't do programming. Anyway, I don't think the source code is available for CQL, is it? (Btw, there's a small GUI front end available for CQL, called VisualCQL.)
Has anyone heard of CQL--Chess Query Language. It is used to find positions within pgn games in a database. I know there is commercial software out there that does just that, but it is rather expensive, especially nowadays. If someone could find a way to incorporate CQL into Scid and make it available as free software it would be great. Are there any programmers out there who are up to the challenge?