Apps with 'Smooth lines' feature
Professional, open-source raster graphics editor with advanced digital painting and sketching tools and workflow features.
DBeaver - Universal Database Manager and SQL Client. DBeaver is free and open source (GPL) universal database tool for developers and database administrators.
Clip Studio Paint, previously Manga Studio or ComicStudio in Japan, is a family of software applications for Mac OS X and Microsoft Windows used for the digital creation of comics...
FireAlpaca is the image editor that can be used readily and easily.