Passgen is an alternative for the random character generator crunch which attempts to solve cracking WPA/WPA2 keys by randomizing the output opposed to generating a list like so, (aaaaaaaa, aaaaaaab, aaaaaac, etc). example usuage with aircrack-ng

python passgen.py -l | sudo aircrack-ng --bssid 00:11:22:33:44:55 -w- WiFi.cap

argument switches are as followed

-b32 base32 
-h hexcode 
-l lowercase ascii 
-l1 lowercase ascii + digits(0-9) 
-U uppercase ascii 
-U1 uppercase ascii + digits 
-lU lowercase + uppercase ascii 
-lU1 lowercase + uppercase ascii + digits 
-C [char] [length] custom character set + length

This application will be updated with new features as needed.
Download Passgen at Github Repository:

https://github.com/blmvxer/passgen/