Carrd - Simple, responsive one-page site creator.
Octotree - Github on steroids
Landing Pages in MailChimp - Easy to build, custom landing pages for free
GitHub Polls - Polls for GitHub issues and readme
Bumble - Bumble is a social network that allows you to feel empowered while you make those connections, whether you’re dating, looking for friends, or growing your professional network. One first move on Bumble could change your life.
Neat.run - Neat puts SaaS notifications in your menu bar. Streamline your code review and ship with ease. Preview, triage, and jump to issues in one click or keystroke.