Ship - Fast, native issue tracking for software projects
Seedproof - Get feedback for your startup ideas 🔥
Pushfolio - Send popup messages with a few lines of Javascript for free.
Landing Pages by Viral Loops - Easily create a landing page for your referral campaign ✌️
Mailbook - The easiest way to collect addresses.
Trivia for Google Chat - Team-building w/ fun quizzes, games right inside Google Chat