harrym

WordPress uses phpass to store passwords. Because WordPress has to work everywere, it uses the portable version of phpass, 
which uses MD5 to hash passwords. MD5 is not a very good hashing algorithm for passwords, because it’s relatively fast.
This plugin switches over to bcrypt, which is the algorithm recommended by phpass, and is a much better option for password 
storage because it is much slower to produce. This makes it much harder for an attacker who’s managed to access your hashed 
passwords to obtain plain text passwords by brute-forcing, or by trying passwords from a dictionary.
Note: this plugin requires PHP 5.3.0 or newer
Be aware that if you use this plugin and then move to a host that does not support bcrypt, you will need to reset any user 
account that you want to log in with.

wp-bcrypt

wp bcrypt switches WordPress's password hashes from MD5 to bcrypt, making it harder for them to be brute-forced if they are leaked.

Michael

Provides means to reset all or selectable passwords (roles, users) and/or to delete (the related) sessions, to define a role-based password expiry, to renew your security KEYs & SALTs and to define & monitor your required password complexity/strength. 
Upon password reset, the related users will be informed by eMail. The eMail text can be edited easily through this plugin. 
When the password expiry function is set, users with the related roles will be required to renew their password upon login, once expired. 
When a certain password strength/complexity has been set, the password strength will be monitored and related hints will be displayed accordingly. 
This plugin is self explanatory and can be accessed through the users menu.
Inspired by: Joe Sexton (PW-Check with Regular Expressions and related basic functions structure) 
Inspired by: andymoyle (Plugin “Emergency password reset V6.1” providing this as a kind of ‘brute force’ functionality) 
Inspired by: Miller Media (Plugin “Expire User Passwords”, providing some basic ideas of functionality but in conflict with the plugin ‘Theme My Login’)

Emergency Management

Handle all security topics: Reset passwords, delete sessions, define role-based password expiries, renew security KEYs & SALTs, define & monit …

wp-bcrypt vs Emergency Management