Slack
Team messaging platform (channels, threads, audio/video huddles, 2,600+ integrations). De facto standard for tech collab, direct Microsoft Teams competitor.
Strengths
- Massive integrations catalog, Zapier, Linear, GitHub, PagerDuty, etc.
- Workflow Builder to automate without code (form → channel notification → followup)
- Slack AI: thread and channel summaries to handle return from vacation
- Built-in audio/video huddles, no need for Zoom for a quick sync
Limitations
- Free tier keeps history 90 days only, beyond that, pay $8/user/month
- Poorly configured notifications destroy focus
- Per-user pricing scales fast in teams (50 users × $8 = $400/month)
Best for
- Tech teams of 5+ people needing workflow integrations
- Public open-source communities
- DesignOps orgs wanting to automate rituals (standup, design crit)