User Activity Log is a free WordPress Monitor plugin. It can track all users' activity like post added, theme changes, etc. on your website. Also get notification to site admin when selected user login to the admin area.
Features:
- User friendly Admin Panel
- Security
- Email settings
- Post/Page Logs
- Comments Logs
- Media Logs
- Users Logs
- Plugin/Theme Logs
- Widgets/Wordpress Logs
- Export Logs
Get this plugin: User Activity Log WordPress Plugin