While true quantum hardware requires massive infrastructure (think dilution refrigerators and absolute zero temperatures), the software stack used to program, simulate, and research these machines is remarkably accessible.
The most exciting project for the keyword "free portable open source quantum computer solutions" is OpenQubit (available on GitHub and Hackaday.io). free portable open source quantum computer solutions
This is the controversial entry. SpinQ (a Chinese company) produces the SpinQ Gemini and SpinQ Triangulum—desktop NMR (Nuclear Magnetic Resonance) quantum computers that weigh roughly 20-30kg. They are portable in the sense that you can put them in a van. The Ultimate Guide to Free, Portable, and Open-Source
The Benefits of Open-Source Quantum Computing Why portable
Quantum Circuit Simulator: A JavaScript-based engine that can run 20+ qubit simulations directly in a web browser or on a Node.js server.
Quantum literacy will soon be as vital as classical coding literacy. By 2028, we expect to see: