Highlight - "Highlight" physical books through conductive pages 📖✨
Buglife - Seriously awesome bug reporting for iOS apps
Lean Canvas - Business plans take too long to write, are seldom updated, and almost never read by others but documenting your hypotheses is key. Lean Canvas solves this problem using a 1-page business model.
SideComments.js - add Medium like comments to your site
Brevy (beta) - Give feedback, Google-doc style, directly on your website
Disbug - Bug reporting tool that records screen and posts to Jira along with console & network logs