mail-tester.com : Free online service that allows you to test your emails for Spam, Malformed Content and Mail Server Configuration problems
MindMeister : MindMeister is an online mind mapping tool that lets you capture, develop and share ideas visually.
Webhook Tester : Webhook Tester allows you to easily test webhooks and other types of HTTP requests.
HTTP Security Report : Get an instant report of how your website measures up to the best practices.
Check connection encryption, content security, information disclosure and...
REDbot : REDbot is lint for HTTP resources; it tests protocol correctness, cacheability, content negotiation and more. REDbot checks HTTP resources to see how ...
Differentiate HTTP headers and content body of two GET URLs.
