There are a growing number of applications and services based on AWS that offer extra functionality or improved ease of use compared to the standard services. In this listing we concentrate on the third-party solutions that could help you build and manage your own AWS-based applications, or those that provide user-friendly interfaces to the underlying service.
Makes your S3 storage available as a Linux block device for remote storage or backup, intended primarily to be used in EC2
Platform: Linux
Pricing: Free and fee-based versions
Use S3 as a permanent data store for relational databases running on EC2
Platform: Linux
Pricing: Fee-based
A platform for running stateful applications in EC2 using S3 for storage
Platform: Linux
Pricing: Free (for start-ups) and fee-based versions
http://code.google.com/p/lifeguard
A tool for automating management of applications deployed in EC2 that receive work through SQS queues; it will dynamically resize the pool of instances based on the application’s performance
Platform: Java program
Pricing: Free (open source)
Remote monitoring and alerting services for applications running on EC2 and S3
Platform: Hosted service
Pricing: Fee-based
Makes your S3 storage available as a POSIX-compliant file system mounted on an EC2 instance
Platform: Linux
Pricing: Fee-based
A platform for creating, managing, and scaling applications built on Amazon’s EC2, S3, and SQS services; the platform provides graphical interfaces for monitoring and interacting with the services
Platform: Internet application
Pricing: Free and fee-based versions
A service that makes the contents of S3 accounts available via an FTP server, hosted by the company or on your own EC2 server
Platform: Any platform with FTP client software
Pricing: Fee-based
Access your S3 storage via a network disk share (WebDAV) on your computer
Platform: Windows, Mac, and Linux
Pricing: Fee-based
http://www.suchwerk.net/sodcms_AMAZON_S3DRIVE.htm
Access your S3 storage available as a Windows shared disk
Platform: Windows / .NET
A web-based manager for Xen virtual machine environments that includes support for EC2. Control the life cycle of EC2 instances and migrate and convert images between EC2 and other virtual machine environments
Platform: Internet application and software component
Pricing: Free (open source) or fee-based (commercial) versions
An ASP.NET payment processing component that supports Amazon.com’s Flexible Payments Service, among other payment services
Platform: ASP.NET component
Pricing: Fee-based
Accepts credit and debit card payments from customers via Amazon Payments on your behalf
Platform: Internet application