Many of you will have heard of Litmus as it’s one of the most popular (and highly rated) email marketing and development tools on the web. Less positive reviews refer to pricing and not to the service itself. There is a free trial, but this automatically becomes a subscription (read the very small print). Otherwise, there’s nothing negative to say about Litmus. They take you through every stage of email marketing, from quality email building which includes a checklist to ensure you haven’t missed anything, spam testing and analytics as well as a Chrome extension for easy desktop access.