One of the neatest bonuses that you get from using pgen instead is that it can also tell you the amount of entropy of passphrases that each combination of settings (wordlist, number of words) will produce. This alone should ideally be reason enough to adopt pgen :)
Open source, runs on your machine.
It makes passwords like:
I named it pgenGet it from https://github.com/ctsrc/Pgen