The DoorStop X Security Suite - Learn. Protect. Understand. Macintosh Internet security products designed, not for security experts, but for the Rest of Us. Always easy to use, our products work together to protect your Mac while helping you learn about and understand the issues involved. Components of our DoorStop X Security Suite include:
The DoorStop X Firewall - blocks and logs access attempts to your Mac. The Mac's first firewall. Leopard version (2.2) now shipping.
The Who's There? Firewall Advisor - helps you to better understand and react to access attempts detected by DoorStop X and most other Mac firewalls. Leopard version (2.2) now shipping.