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Open Source

May The Source Be With You! Articles about Open Source and Free Software as a philosophy, and its application to software development and project management.

submission guidelines

UPDATED APRIL 8, 2020

To keep this tag clean and meaningful, please ensure your post fits into at least one of the following categories:

Organizing, managing, running, or working in an Open Source project.
Open Source philosophy, licensing, and/or practical and legal topics thereof.
Advocacy and adoption of Open Source philosophy.

DO NOT use this tag if you are simply using technologies which happen to be open source.

You should NOT use this tag for any of the following:

Promoting open source projects, such as feature lists or announcements. (Use #news or Listings.)
Contributor requests. (Use #contributorswanted or Listings.)
Tutorials/articles that happen to use an open source tool. (Use appropriate technology tags.)
Showing off something you've built that happens to be open source. (Use the #showdev tag.)
Sharing lists of open source projects. (Use #githunt or the appropriate technology tags.)

Projects must comply with the Open Source Definition (see below) to legally use the term "open source".

As all "Free Software" officially complies with the standards of Open Source anyway, this tag covers both (collectively, FOSS).

about #opensource

Open Source is so much more than "you can read the code". It is formally defined by the Open Source Initiative.

"Open Source" should not be confused with the similar Free Software, which is defined by the Free Software Foundation. Generally, all Free Software is also Open Source, and the two camps often cooperate; however, the concepts are distinct! (The tags are merged here on DEV.to for simplicity, however.)

Open Source Hardware is defined and overseen by the Open Source Hardware Assocation

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MCBEPluginModer

Apr 13

Building PeerLink — a decentralized P2P messenger in C++ with NAT traversal and relay fallback

#opensource #cpp #network #p2p

3 min read

Apr 14

Zero application code for a REST API — semantic navigation with LinkLab

#typescript #webdev #api #opensource

6 min read

Apr 13

Open Source LLMs in 2026: Can Llama 4 / DeepSeek V3 Replace GPT for Business?

#ai #automation #llm #opensource

7 min read

Horilla

Apr 13

How we cut our Claude Code token costs by 80% — and the open-source tool we built to do it (v1.1.4, 13 commands)

#ai #claudecode #productivity #opensource

5 min read

Apr 11

I Built an Open-Source n8n Alternative with AI Agents — Here's What I Learned

#opensource #ai #webdev #selfhosted

2 min read

Apr 24

The "Free" Tool You Just Used Probably Sold Your Personal Data. Here's Why That's Allowed & What Changes It.

#privacy #webdev #productivity #opensource

6 min read

Luke Fryer

Apr 13

How we built a type-safe prompt engineering framework in TypeScript

#typescript #ai #webdev #opensource

2 min read

Apr 13

We built an open-source security scanner for MCP servers

#security #python #ai #opensource

3 min read

Apr 13

The State of MCP Security 2026: Incidents, Attack Patterns, and Defense Coverage

#security #ai #mcp #opensource

15 min read

Apr 13

Your LLM already thinks in graphs. Your codebase is a graph. Connect them.

#mcp #ai #devtools #opensource

2 min read

tian

Apr 13

Here comes the ultimate tool for rendering GeoJSON in CesiumJS

#showdev #javascript #opensource #tooling

15 min read

Apr 13

Why Domain Allowlists Aren't Enough for AI Agent Security

#security #ai #devops #opensource

11 min read

Navneet Singh Rajput

Apr 13

Stop Using Alerts Wrong: How to Actually Use the Alert Component in ScreenUI

#react #opensource #webcomponents #nextjs

2 min read

sneh1117

Apr 13

I built a typing speed test in one HTML file — no dependencies, free to host forever

#webdev #javascript #beginners #opensource

3 min read

Apr 13

Agentic Analytics on the Apache Lakehouse

#agents #analytics #dataengineering #opensource

4 min read

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