Mailook - Identify & fix your email deliverability issues for free 👀
FlowMapp - FlowMapp is a UX planning tool for creating visual sitemaps and user flow.
Mailivery - Reach the Inbox, not the spam folder.
Octopus.do - Build your website structure in real-time and rapidly share it to collaborate with your team or clients. Start prototyping websites or apps instantly.
Postal - Open source mail delivery platform, alternative to Mailgun or Sendgrid
DYNO Mapper - Create Sitemaps with the DYNO Mapper Visual Sitemap Generator.