shawfactor

This plugin adds an extra columns to the users overview with the date of the last login for each user and the number of times each user has logged in.
Additionally, users can be sorted by the date of their last login and the number of times they have logged in
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LH Login Logger

Make the last login for each user visible in the user overview. Track the number of times a user has logged in

Patrick Chia

This is very simple plugin to provides information about the last login activity on you blog account, If you’re concerned about unauthorized access to your blog account, you’ll be able to use this information to find out if and when someone gained access. 
The IP address is also useful. If you always or most often sign in to your blog account using a single computer, your IP address should be the same, or start with the same two sets of numbers (for example, 125.16.xx.xx). If you’re seeing an IP address that differs greatly from your usual IP address, it could either mean that you’ve recently accessed your account from a different location, or that someone has accessed your blog.

WordPress Last Login

This feature provides information about the last login activity on your blog account and any concurrent activity.

LH Login Logger vs WordPress Last Login