Jungle Scout - Amazon product research made easy.
File-Extensions.org - Large computer file extension library with detailed explanation of each file type with links to download free or associated software programs.
Reviewbox - E-commerce data tool to monitor customer reviews, track online pricing, optimize AMS tools, and more from Amazon, Walmart, and other major online retailers.
FileProInfo - It's All About Files, Software, Online Tools - 100% Free
Helium 10 - Our software contains multiple Amazon seller tools to help you find high ranking keywords, identify trends, spy on competitors, & optimize product listings.
GroupDocs - GroupDocs is a web-based service for online document sharing, collaboration and management.