I know Qt (have an open-source project based on it https://github.com/a-rodin/qstardict https://github.com/a-rodin/qstardict), but don't want to work with GUI.

I know Qt (have an open-source project based on it https://github.com/a-rodin/qstardict https://github.com/a-rodin/qstardict), but don't want to work with GUI. I think I would like some libraries or applications that run on server and so some complicated jobs that require high performance.