Ages ago I wrote a simple GUI app called Glyphtracer to simplify the task of creating fonts from scanned images. It seems people are still using it. The app is written in Python 2 and Qt 4, so getting it running becomes harder and harder as time goes by.
Thus I spent a few hours porting it to Python3 and PyQt 5 and bumped the major version to 2.0. The program can be obtained from this Github repo.