  Tangelo [link: https://github.com/goodchemistryco/Tangelo] is an open-source
Python software package for the development of end-to-end chemistry workflows
on quantum computers, released under Apache 2.0 license. It aims to support the
design of successful experiments on quantum hardware, and to facilitate
advances in quantum algorithm development. The software enables quick
exploration of different approaches by assembling reusable building blocks and
algorithms, with the flexibility to let users introduce their own. Tangelo is
backend-agnostic and enables switching between various backends (Braket,
Qiskit, Qulacs, Azure Quantum, QDK, Cirq...) with minimal changes in the code.
The package can be used to explore quantum computing applications such as
open-shell systems, excited states, or more industrially-relevant systems by
leveraging problem decomposition at scale. This paper outlines the design
choices, philosophy, and main features of Tangelo.
