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   * [Tefter](https://tefter.io) - Bookmarking app with a powerful Slack integration. Free for open-source teams.
   * [twist.com](https://twist.com) — An asynchronous-friendly team communication app where conversations stay organized and on-topic. Free and Unlimited plans available. Discounts provided for eligible teams.
   * [typetalk.com](https://www.typetalk.com/) — Share and discuss ideas with your team through instant messaging on the web or on your mobile
+  * [Tugboat](https://tugboat.qa) - Preview every pull request, automated and on-demand. Free for all, complimentary Nano tier for non-profits.
   * [whereby.com](https://whereby.com/) — One click video conversations, for free (formerly known as appear.in)
   * [wistia.com](https://wistia.com/) — Video hosting with viewer analytics, HD video delivery and marketing tools to help understand your visitors, 25 videos and Wistia branded player
   * [yammer.com](https://www.yammer.com/) — Private social network standalone or for MS Office 365. Free with a bit less admin tools and user management features