For example, the contributors to Qt have varied over time, but in past years major contributors have included Digia, KDAB and Blackberry. The first two did so m

For example, the contributors to Qt have varied over time, but in past years major contributors have included Digia, KDAB and Blackberry. The first two did so mostly to sell consulting services, and Blackberry did so because it was a major part of their OS. That said, Qt is a bit of a special case. It has a unique history and The Qt Company has an agreement with KDE that there will be ongoing open source releases. https://www.kde.org/community/whatiskde/kdefreeqtfoundation.php https://www.kde.org/community/whatiskde/kdefreeqtfoundation....