Qt started off with a commercial license in 1995, adding GPL in 2000. But the lack of an LGPL option is what (arguably) lead to the rise of GNOME&#x2F;GTK when that project started in 1997, because it&#x27;s the LGPL that allows organizations to write closed-source proprietary software without paying a license fee. [Edit: corrected Qt&#x27;s original license history.]