eBooks.com - eBooks.com is a leading retailer of ebooks, with a vast range of ebooks from academic, popular and professional publishers.
RegexBuddy - RegexBuddy is your perfect companion for working with regular expressions.
Kobo Books - Kobo Books is a best in the class eBooks and eReadering apps for many reasons.
Regex Hero - Online Silverlight regular expression tester with instantaneous highlighting, C# and VB.NET code generation, code completion, regex analysis, benchmarking, and more.
Amazon Kindle Store - The Amazon Kindle eBook store is the biggest and most widely used eBook store on the web.