Upscribe - Embeddable lead generation forms for Medium
Contact Form - Make it easy to talk to your customers
Marvel Embeds - Embed interactive prototypes on any site (including Medium!)
Tripetto - Visual editor and more - for self-hosted forms and surveys
Refined Medium - Chrome & Firefox extension that removes clutter on Medium
SendgoMail - Sendgomail is a trusted DIY email marketing tool with various clients when they need to send email campaigns without worrying about installing email software.