Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Pyforms - Pyforms is a Python 3 framework to develop applications capable of executing in 3 diferent environments, Desktop GUI, Terminal and Web.
Sketch - Professional digital design for Mac.
libavg - libavg is a high-level development platform for media-centric applications.
Affinity Designer - Professional creative software, exclusively for Mac.
wxPython - wxPython is a GUI toolkit for the Python programming language.