Whichever number we provide will go out of date at some point.
It's extra maintenance, and if we only put a rough number (e.g. 100k+) then it's
not really meaningful in my opinion.

Alternatively, we could point at the web index of the packages.
E.g. 
- Pypi: https://pypi.org/
- Gauche: http://practical-scheme.net/wiliki/wiliki.cgi?Gauche%3aPackages
etc.

-- 
Pierre Neidhardt
https://ambrevar.xyz/