IOSHunter is an IOS search engine.
Edit by : IOSHunter is the excellent choice if you want to find suitable IOS image for your router or switch. It browses various FTP servers and web pages to find the requested image. IOSHunters search engine is multithreaded, so the process of searching is rather fast. Current version of IOSHunter searches for images in more than 1800 sources all over the world.

IOSHunter can find images for:
Cisco Routers:

Cisco 800 Series Routers
Cisco 1000 Series Routers
Cisco 1600 Series Routers
Cisco 1700 Series Modular Access Routers
Cisco 1800 Series Routers
Cisco 2500 Series Routers
Cisco 2600 Series Multiservice Platforms
Cisco 2800 Series Routers
Cisco 3600 Series Multiservice Platforms
Cisco 3700 Series Multiservice Access Routers
Cisco 3800 Series Integrated Services Routers
Cisco 4000 Series Routers
Cisco 7000 Series Routers
Cisco 7200 Series Routers
Cisco 7400 Series Routers
Cisco 7500 Series Routers
Cisco 10000 Series Routers
Cisco 10700 Series Routers
Cisco 12000 Series Routers
Cisco Aironet AP350 Series
Cisco Aironet 1100 Series
Cisco Aironet 1200 Series
Cisco Aironet 1300 Series
Cisco Aironet 1400 Series
Cisco SOHO 70 Series Routers

Cisco 700 Series ISDN Access Routers

Cisco IGS Series Routers
CiscoPro CPA 900 Series Routers

Cisco Catalyst Switches:

Cisco Catalyst 1900 Series Switches
Cisco Catalyst 2800 Series Switches
Cisco Catalyst 2900 Series XL Switches
Cisco Catalyst 2950 Series Switches
Cisco Catalyst 3500 Series XL Switches
Cisco Catalyst 3550 Series Switches
Cisco Catalyst 3560 Series Switches
Cisco Catalyst 4000 Series Switches
Cisco Catalyst 5000 Series Switches
Cisco Catalyst 6500/6000 Series Switches
Cisco Catalyst 8500 Series Multiservice Switch Routers

Cisco Access Servers:

Cisco AS5200 Series Access Servers
Cisco AS5300 Series Access Servers
Cisco AS5350 Series Access Servers
Cisco AS5400 Series Access Servers
Cisco AS5800 Series Access Servers
you can free download IOSHunter 3.2 now.