Marketo - Marketo's powerful marketing automation software helps marketers master the art & science of digital marketing to engage customers and prospects.
Meta Tags - Meta Tags is a tool to debug and generate meta tag code for any website.
Constant Contact - Constant Contact offers email marketing, social media marketing, online survey, event marketing, digital storefronts, and local deals tools.
Devhints - TL;DR for developer documentation
Omnisend - Omnisend - Marketing Automation for Ecommerce provides the omnichannel approach for sales-driven marketers that have outgrown the generic email marketing platforms.
Meta Tag Generator - Generate HTML code optimal for SEO, social media, & mobile.