kriss73

This plugin creates a Dashboard Widget and a admin page to display IP, username, date and time of each user login. 
Only administrators can see this information on admin panel.

WP Login Register

Keep track the users login. The plugin allows to save the data of each user's login (IP, username, date, time).

Now 'utopiamech'

Replacement for third-party timing scripts (cron) for timing events. Enter URLs and time intervals to get the URLs loaded at about those times. Useful for scripts that need a specific URL called to ‘manage’ the script.

Utopia Cron

Makes it easy to set up (semi)-timed page load events without messing with cron or other third-party timing scripts.

WP Login Register vs Utopia Cron