Free passgen software for linux

CryptNET Password Candidate Generator is a password generator. It generates a list of password candidates for the user to choose from by mapping operating system sources of pseudorandomness into printable character arrays using a mod operation.
It is capable of generating passwords composed of printable characters, alpha numeric characters, alphabetic characters, or numeric only characters.
By default, passgen generates 12 character passwords.
With current grid and cluster computing technology, that is considered the minimum number of characters a password needs in order to be safe from a brute force or dictionay attack.
Enhancements:
- Support for a system wide configuration file is now available, allowing administrators to set defaults that match their local password selection security policies.
- Some minor bug fixes have been made, and some help text formatting improvements have been applied.
- Finally, autotools support has been improved in order to simplify the installation process.