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Top 100 AI GitHub activity AI categories AI Compare Saved AI tools Learn about AI Categories Collections Newly added Underrated this week Technology stacks Tags Licenses Compare tools About AltStack Advertise

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Created by Sushil Kumar Sah.

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obsidian

Compare 4 tools listed here. Check what each tool does and whether it has a free option.

Search for a tool or task, check its pricing, and open its official website. Freemium means a free plan with paid upgrades.

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Catalog updated · 14 Oct 2026

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Joplin product interface

Joplin

Note-Taking Tools

Pricing not verified

Encrypted note-taking that syncs across all your devices.

We have not checked this tool’s current pricing. Visit its official website before choosing a plan.

57kstars+ 34830 daysUnknown

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SiYuan product interface

SiYuan

Note-Taking Tools

Pricing not verified

Privacy-first knowledge management with block-level linking.

We have not checked this tool’s current pricing. Visit its official website before choosing a plan.

47kstars+ 44030 daysAGPL-3.0

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Khoj product interface

KhojAI

AI Personal Assistants

Free self-hosted option

AI second brain for research, automation, and personal agents.

The project provides a self-hosted free-software option. Running a server and using cloud model or search APIs can cost money; local models use your hardware. The managed service has separate plans whose current amounts were not established in this check.

38kstars+ 36430 daysAGPL-3.0

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itsnotes product interface

itsnotes

Note-Taking Tools

Pricing not verified

Self-hosted sticky notes with better organization.

We have not checked this tool’s current pricing. Visit its official website before choosing a plan.

35stars+ 430 daysMIT

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1–4 of 4 tools