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.

Open-DSI

Create sessions (specific date) and organize them in a group of sessions linked to your Sensei course. Sessions are displayed in between the course Modules and / or Lessons. The plugin also lets you restrict Module access before a certain date (for example, the previous session date).
Made for the <a href="https://woocommerce.com/products/sensei/" rel="nofollow ugc">Sensei</a> Learning Management System plugin for WordPress.

Course Session For Sensei

Manage sessions and group of sessions for your Sensei LMS courses.

Safer Cookies vs Course Session For Sensei