I started to write a small function that I use somewhat regularly to calculate sample size from coefficient of variation. I checked JuliaStats/StatsBase to see if any sample size functionality was included and I did not see anything.
I figured a thread here would be a helpful paper trail for anyone else.
Further searching turned up a few repos including:
Are there any packages I missed?
The experimental-design org seems to be fairly recent and uses at least 1.0.