Buffer is a software application for the web and mobile, designed to manage accounts in social networks.

Upscribe is a simple email marketing tool. Send email newsletters, drip campaigns, and collect subscribers using embeddable opt-in forms.

Delightfully simple postcard and letter marketing. Design, mail & track personalized direct mail postcards and letters. Digital marketers use Mailjoy to send data-driven direct mail marketing campaigns. Mailjoy provides a ton of features to help you create mailing lists from your contacts, design beautiful mailers, track conversions, and integrate with the tools you already use. Sending a campaign takes only minutes. Use Mailjoy for a single campaign or make it a part of your marketing toolkit.

Marketing Stack is a curated directory of marketing resources and tools (inspired by Startup Stash).