List of 10 great open-source alternatives for popular tools

List of 10 great open-source alternatives for popular tools, with their official GitHub links so you can explore, star, or fork them right away:

📊 1. Metabase

Alternative to: Tableau, Power BI
What it does: Easy, open-source business intelligence and dashboard tool.
GitHub: metabase/metabase

💬 2. Mattermost

Alternative to: Slack, Microsoft Teams
What it does: Secure, self-hosted messaging and collaboration platform for teams.
GitHub: mattermost/mattermost

☁️ 3. Nextcloud

Alternative to: Google Drive, Dropbox
What it does: Self-hosted cloud storage, file sharing, calendar, and collaboration suite.
GitHub: nextcloud/server

📝 4. LibreOffice

Alternative to: Microsoft Office (Word, Excel, PowerPoint)
What it does: Full open-source office suite (docs, spreadsheets, presentations).
GitHub: LibreOffice/core

🎥 5. OBS Studio

Alternative to: Streamlabs, XSplit
What it does: Best open-source software for live streaming and screen recording.
GitHub: obsproject/obs-studio

📅 6. OpenProject

Alternative to: Jira, Asana, Trello
What it does: Project management tool with Gantt charts, agile boards, and time tracking.
GitHub: opf/openproject

📚 7. Moodle

Alternative to: Blackboard, Canvas
What it does: Popular open-source Learning Management System (LMS) for schools, universities, and online courses.
GitHub: moodle/moodle

🔐 8. Bitwarden

Alternative to: LastPass, 1Password
What it does: Secure open-source password manager you can self-host.
GitHub: bitwarden/server

📈 9. Apache Superset

Alternative to: Looker, Tableau
What it does: Open-source data exploration and visualization web app for big data analytics.
GitHub: apache/superset

🗄️ 10. Gitea

Alternative to: GitHub, GitLab
What it does: Lightweight, self-hosted Git service with a nice web UI.
GitHub: go-gitea/gitea

✅ Pro Tip: All these projects are active, have big communities, and usually offer Docker images for easy self-hosting.