This is an open-source framework for quantum computing founded by IBM Research. This site is an excellent resource to not only learn how to use this package, but to learn about the basics and motivation behind quantum computing.

Qiskit is a quantum circuit construction, optimization, and execution engine. Additional algorithm and application layers within Qiskit leverage quantum circuits, often in concert with classical computing resources, to solve problems in optimization, quantum chemistry, physics, machine learning, and finance.