Heroku - Backend server hosting - $7 Cron To Go - Heroku add on for cron jobs - $9 Approximated - Handle unlimited custom domains - $20 Vercel - Indivisual site hosting - $20 Rewardful - Affiliate program - $30 Digtial Ocean - Spaces for some image hosting - $5 Upscribe - Email marketing and drip campaign - $9 Splitbee - App Analytics and email automation - $32 GSuite - Two email accounts - $13. Source: almost 3 years ago

You can even use custom embeds! Notion includes multiple of these by default such as Google Maps, Typeforms, or tweets. Embeds make just about any custom html possible. I used this upscribe embed form below to handle early access sign ups for the service. Source: about 3 years ago

Listmonk is fantastic -- I use it for the newsletter of my own blog and am amazed by how simple it was to set up and how easy it is to operate and use every time I send out a newsletter. Prior to Listmonk I used Mailtrain[0] and like Listmonk so much I want to run it as a service (with 30% donated back to the Listmonk project of course) -- deliverability worries and initial setup aside it's just the kind of... - Source: Hacker News / almost 3 years ago

Never tried but have a look at Mosaico and GrapesJS. Both are open-sourced and used by Mailtrain. Source: about 3 years ago