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   * [flat.social](https://flat.social) - Interactive customizable spaces for team meetings & happy hours socials. Unlimited meetings, free up to 8 concurrent users.
   * [GitDailies](https://gitdailies.com) - Daily reports of your team's Commit and Pull Request activity on GitHub. Includes Push visualizer, peer recognition system, custom alert builder. Free tier has unlimited users, 3 repos, 3 alert configs.
   * [gitter.im](https://gitter.im/) — Chat, for GitHub. Unlimited public and private rooms, free for teams up to 25
+  * [Hackmd.io](https://hackmd.io/) - Real time collaboration & writing tool for markdown format docs/files. Like GoogleDocs but for markdown files. Free unlimited number of "notes", but number of collaborators (invitee) for private notes & template [will be limited](https://hackmd.io/pricing).
   * [hangouts.google.com](https://hangouts.google.com/) — One place for all your conversations, for free, need a Google account
   * [HeySpace](https://hey.space) - Task management tool with chat, calendar, timeline and video calls. Free for up to 5 users.
   * [helplightning.com](https://www.helplightning.com/) — Help over video with augmented reality. Free without analytics, encryption, support