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mypaint?

Sublime Text 2 & 3.

Sublime Text 2 is written in C++

https://news.ycombinator.com/item?id=2822114

My Veusz plotting package is pretty responsive and is written with PyQt. A few of the inner loops were recoded into C++, but the majority of the code is python.

Dropbox

Kupfer and Gajim

Dropbox, Anki, FreeCAD