A curated list of open source alternatives to paid SaaS apps, with licenses and GitHub stars.
▶ Watch: 10 Open-Source Alternatives That Replace Paid SaaS (2026)
Looking for a free, self-hostable replacement for a paid tool? Find the tool below and pick an alternative. Want to add yours? Submit it here, see CONTRIBUTING.md.
- Productivity
- Communication
- Design
- Analytics
- Automation
- Storage
- E-commerce
- CRM
- Project Management
- Marketing
- AI
- Security
- Developer Tools
- Monitoring
- Customer Support
- Forms
- Finance
- Video
- Publishing
- Product
- Education
All-in-one workspace for notes, docs and wikis.
| Alternative | Description | License | Stars |
|---|---|---|---|
| AppFlowy | Privacy-first Notion alternative built with Flutter and Rust. | AGPL-3.0 | ★ 77k |
| AFFiNE | Docs, whiteboards and databases in one local-first workspace. | MIT | ★ 73k |
| SiYuan | Local-first personal knowledge management system. | AGPL-3.0 | ★ 47k |
| Logseq | Privacy-first outliner for notes and knowledge. No native databases. | AGPL-3.0 | ★ 45k |
| Huly | Huly — All-in-One Project Management Platform (alternative to Linear, Jira, Slack, Notion, Motion) | EPL-2.0 | ★ 28k |
| focalboard | Focalboard is an open source, self-hosted alternative to Trello, Notion, and Asana. | NOASSERTION | ★ 26k |
| docmost | Docmost is an open-source collaborative wiki and documentation software. It is an open-source alternative to Confluence and Notion. | AGPL-3.0 | ★ 22k |
Spreadsheet-database hybrid.
| Alternative | Description | License | Stars |
|---|---|---|---|
| NocoDB | Turns any database into a smart spreadsheet. | AGPL-3.0 | ★ 65k |
| Baserow | No-code database and application builder. | MIT | ★ 6.1k |
Scheduling and booking.
| Alternative | Description | License | Stars |
|---|---|---|---|
| Cal.com | Scheduling infrastructure for everyone. | MIT | ★ 49k |
Documents, spreadsheets and presentations.
| Alternative | Description | License | Stars |
|---|---|---|---|
| DeckCraft | Presentations and slide shows: an open-source, clean-room reimplementation of Microsoft PowerPoint in pure Rust. Part of the ArtCraft Crafting Apps. |