Janis Elsts

Normally when you login to your blog WordPress will create a session cookie that is used to authenticate you. If someone was to steal the cookie they would be able to use it to get full access to your blog without having to know your password. This plugin prevents that from happening – it makes the cookie specific to your IP address, so it won’t be usable from a different computer.
Use this plugin if you have a static IP. If you have a dynamic IP address and it changes often you will get logged out frequently.
A bit more info can be obtained from the <a href="http://w-shadow.com/blog/2008/07/12/safer-cookies-plugin-for-wordpress/" title="Safer Cookies homepage" rel="nofollow ugc">Safer Cookies homepage</a>

Safer Cookies

Ties the WP session cookie to your IP address so that it can't be used to get access to you blog from another computer.

Eric Mann

Adds <code>$_SESSION</code> functionality to WordPress, leveraging the database where needed to power multi-server installations.
Every visitor, logged in or not, will be issued a session. Session data will be stored in the WordPress database by default 
to deal with load balancing issues if multiple application servers are being used. In addition, the session collection will 
also be stored in memory for rapid use within WordPress.
Session data stored in the database can be encrypted at rest for better security.

WP Session Manager

Amazing!

good

I am using WP Session Manager in several projects since some years. Initially, I was looking for a more reliable session management compared to standard PHP sessions – and found it in WP Session Manager. Thanks for this great plugin!

Very useful and reliable

Good code quality, very useful when you need the joy of sessions :) Keep it up.

Safer Cookies vs WP Session Manager