Upscribe - Embeddable lead generation forms for Medium
Timer Tab - Online countdown timer, alarm clock, and stopwatch.
Marvel Embeds - Embed interactive prototypes on any site (including Medium!)
Gestimer - For those little reminders during the day
Refined Medium - Chrome & Firefox extension that removes clutter on Medium
Online Stopwatch - Online Stopwatch is free to use online tool that allows you to keep track of the important events and tasks that you are performing.