IBM Qiskit is an open-source software development kit (SDK) for working with quantum computers at the level of circuits, algorithms, and application modules.
The Repository is https://github.com/Qiskit/qiskit
If you are interested in using quantum services (i.e. using a real quantum computer, not a simulator) you can look at the Qiskit Partners program for partner organizations that have provider packages available for their offerings: https://qiskit.org/documentation/partners/
For more information, please refer to the official website and Wikipedia.
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