Obsidian is the gold standard for personal knowledge management, storing everything in plain-text markdown files on your own device.
Cal.com is the modern open-source alternative to Calendly, offering unlimited event types, white-label branding, and self-hosted privacy.
| Pricing | Free | Free |
|---|---|---|
| Free Trial | ✗ No | ✗ No |
| User Rating | 4.8/5 (3.8K) | 4.8/5 (1.4K) |
| Open Source | ✓ Yes | ✓ Yes |
| Category | Productivity | Productivity |
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