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What does open source mean?
Open source means software whose code is public, so anyone can read it, use it, and often change it.
- Category GitHub & code
- Also called open-source
- Updated 20 Oct 2026
Open source, explained simply
Open-source projects share their code under a license that sets the rules. Those rules say what you can and can't do.
Many free AI tools are open source. That lets people check how they work and build on them.
Open source doesn't always mean free of rules. Read the license before you use a tool for business.
For example, you can download an open-source tool and see exactly what it does.
On ITG Now, our tool guides and top GitHub lists focus on open-source tools, and note the license for each.
Related terms
Software licenseMIT LicenseApache 2.0GPLOpen weightsGitHub
Where you'll see it on ITG Now
- GuideOpenDesign: Free Open Source AI Design Tool for Teams
- GuideOpenHuman: Open Source AI Agent App That Runs Lean (2026)
- GuideOpenCut: Free CapCut Alternative, Open Source (2026 Guide)
- GuideDBX: Free Database Client for 100+ Databases, With AI (2026)
- GuideOpenSEO: Free Semrush Alternative, Open Source (2026)
- GuideRecordly: Free Screen Recorder With Auto-Zoom (2026)
Questions people ask about Open source
Is open source always free?
The software is usually free to download. Some companies charge for support, hosting, or extra features.
Open source vs open weights: what is the difference?
Open source shares the code. Open weights shares only the trained AI model files, often with its own rules.
Is open source safe?
Anyone can inspect the code, which helps. You should still check who made it and keep it updated.