Postal - Open source mail delivery platform, alternative to Mailgun or Sendgrid
Marketing Budgets 2020 - Research on budgets and effectiveness of marketing channels.
Mailook - Identify & fix your email deliverability issues for free 👀
Makerbook - A directory of the best free resources for creatives
Sidemail - The simplest way to send transactional emails. Sidemail makes sending transactional emails trivial, it's perfect for side projects, MVPs or the next big thing.
Attributer - Know what marketing channels are driving customers & revenue