Social Pomodoro - Meet an accountability buddy for 25 minutes of focused work.
Email Marketing: A Beginner's Guide - Master email marketing with these 3 short ebooks from Drip.
Focusmate - Distraction-free productivity via virtual coworking
HubSpot Free Email Marketing - Powerful drag and drop email marketing in the HubSpot CRM
Publicly - Build in the open
Google Sheets Email Marketing - Email automation and validations directly from Google Sheets