Practical Tool - Circuit Builder

Editor: https://algassert.com/quirk

alternative : https://quantum-computing.ibm.com/composer/docs/iqx/build-circuits

https://github.com/Qiskit/openqasm

https://quantum-circuit.com/

Overview of features:

https://algassert.com/quirk#circuit=%7B%22cols%22%3A%5B%5B1%2C%22H%22%5D%2C%5B%22%E2%80%A6%22%2C%22%E2%80%A2%22%2C%22X%22%5D%2C%5B%22%E2%80%A6%22%2C%22%E2%80%A6%22%5D%2C%5B1%2C1%2C%22%E2%80%A6%22%2C%22%E2%80%A6%22%5D%2C%5B%22~87lj%22%2C%22Bloch%22%5D%2C%5B%22Bloch%22%5D%2C%5B%22%E2%80%A2%22%2C%22X%22%5D%2C%5B%22H%22%2C%22Bloch%22%5D%2C%5B%22Measure%22%2C%22Measure%22%5D%2C%5B1%2C%22%E2%80%A2%22%2C%22X%22%5D%2C%5B1%2C1%2C%22%E2%80%A2%22%2C%22X%22%5D%2C%5B1%2C1%2C1%2C%22%E2%80%A2%22%2C%22X%22%5D%2C%5B1%2C1%2C1%2C1%2C%22%E2%80%A2%22%2C%22X%22%5D%2C%5B%22%E2%80%A2%22%2C1%2C%22Z%22%5D%2C%5B1%2C1%2C%22%E2%80%A2%22%2C%22Z%22%5D%2C%5B1%2C1%2C1%2C%22%E2%80%A2%22%2C%22Z%22%5D%2C%5B1%2C1%2C1%2C1%2C%22%E2%80%A2%22%2C%22Z%22%5D%2C%5B%22Bloch%22%2C%22Bloch%22%2C%22Bloch%22%2C%22Bloch%22%2C%22Bloch%22%2C%22Bloch%22%5D%2C%5B1%2C1%2C1%2C1%2C%22~f7c0%22%2C%22~f7c0%22%5D%5D%2C%22gates%22%3A%5B%7B%22id%22%3A%22~87lj%22%2C%22name%22%3A%22message%22%2C%22circuit%22%3A%7B%22cols%22%3A%5B%5B%22e%5E-iYt%22%5D%2C%5B%22X%5Et%22%5D%5D%7D%7D%2C%7B%22id%22%3A%22~f7c0%22%2C%22name%22%3A%22received%22%2C%22matrix%22%3A%22%7B%7B1%2C0%7D%2C%7B0%2C1%7D%7D%22%7D%5D%7D