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Tg – the open source timegrapher
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Tg is a timegrapher program: a software used to regulate
mechanical watch movements and evaluate their performance. Tg detects the
noise produced by the mechanism of a watch, analyzing that noise it
computes real-time readings of the rate (i.e. how fast or slow the watch
runs) and other operational parameters (beat error, amplitude).

Tg is in development, and there is still no manual.
For more info on tg see https://github.com/vacaboja/tg
and
this thread at WUS. In particular, the calibration procedure is
described at
this post.