WordFence will scan the integrity of the website files for changes or malware, protect website from brute force login hacks, and monitor website traffic. It uses the Threat Defense Feed to automatically update firewall rules which will protect you from the latest threats in real-time.
Jetpack is made by WordPress experts to make WP sites safer and faster, and help you grow your traffic. It provides easy-to-use, comprehensive WordPress site maintenance service including auto real-time backups and easy restores, malware scans, and spam protection. Essential features like brute force protection and downtime / uptime monitoring are free.