Pijul is an interesting VCS based on the darcs patch methodology: https://pijul.org/ (also faster, but due to algo choices)
miniblog.
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PYPL: PopularitY of Programming Language https://pypl.github.io/PYPL.html is a nice PL metrics tracker that's an alternative to TIOBE.
It has a clear methodology and it carefully chooses keywords to avoid e.g. Python metrics being affected by interest in snakes.
Quantifying Gnome contributions by frequency, tenure, and affiliated companies:
https://hpjansson.org/blag/2020/12/16/on-the-graying-of-gnome/
Whilst the methodology can't be perfect, it's a nice way of measuring contribution trends.
A brilliant example of Twitter's character count methodology being rather unbalanced! (So many sites *advantage* English speakers.)