General-purpose SDKs
56 resources
Broad frameworks for building, simulating, and experimenting with quantum circuits across multiple domains.
Open category
Learn
Explore the open-source quantum software ecosystem with an operator's eye.
Qtangl's library maps the projects, frameworks, simulators, optimization tools, and learning resources that define the modern quantum software landscape. Start broad, narrow by category, and then dive into the resources most relevant to how you want to learn or build.
Library snapshot
A readable map of the ecosystem, not just a dump of links.
The learn section turns a large reference corpus into category pages, resource explainers, and topic guides so people can understand what is out there before deciding where to go deeper.
Resources
157
Indexable resource pages generated from the local reference corpus.
Categories
16
Distinct ways to navigate the ecosystem by problem type and workflow.
Topic guides
6
Editorial paths that tie library pages together around real questions.
Explore by category
See what kinds of tools are actually out there.
The ecosystem is easier to understand when it is grouped by the job each project helps you do: build circuits, simulate behavior, compare optimization methods, learn the basics, or work closer to hardware.
Simulators
10 resources
Projects focused on state-vector, stabilizer, tensor-network, or hardware-inspired quantum simulation.
Open category
Quantum chemistry
5 resources
Libraries that connect quantum computing workflows to chemistry, electronic structure, and molecular modeling.
Open category
Optimization and QUBO
6 resources
Libraries for expressing and solving combinatorial optimization problems with QUBO, QAOA, or related formulations.
Open category
Annealing and Ising
16 resources
D-Wave and Ising-model tools for quantum annealing, embeddings, and heuristic search workflows.
Open category
Quantum machine learning
1 resources
Libraries and experiments combining quantum circuit workflows with machine learning models or differentiable programming.
Open category
Photonics
4 resources
Frameworks for photonic quantum computing, boson sampling, and optical circuit representations.
Open category
Pulse and control
8 resources
Tooling for low-level pulse scheduling, experiment orchestration, and laboratory control around quantum hardware.
Open category
Compilers and languages
18 resources
Compilers, intermediate representations, domain-specific languages, and transpilation tools for quantum programs.
Open category
Error correction and mitigation
4 resources
Projects that help analyze, mitigate, or correct quantum errors and noisy computation.
Open category
Networking
2 resources
Simulators and frameworks for quantum networking, distributed entanglement, and communication systems.
Open category
Post-quantum cryptography
5 resources
Libraries and standards implementations for quantum-safe cryptography and related security tooling.
Open category
Games and learning
11 resources
Interactive projects, puzzles, and educational resources for learning quantum computing concepts.
Open category
Visualization and tomography
5 resources
Tools for visualizing circuits, reasoning about states, and reconstructing quantum systems from measurements.
Open category
Benchmarks and analysis
3 resources
Benchmark suites, performance studies, and analysis tooling for comparing quantum software and hardware workflows.
Open category
Cloud and interoperability
3 resources
Projects that connect quantum workflows across providers, cloud runtimes, and software ecosystems.
Open category
Start with the tentpoles
Flagship resources worth understanding first.
These are the projects newcomers search for most often and the ones most likely to anchor the rest of the ecosystem in your head.
awsCloud and interoperability
amazon-braket-sdk-python
amazon-braket-sdk-python is an open-source quantum project.
MixedUnknownFlagshipQtangl relevant
dwavesystemsAnnealing and Ising
dwave-ocean-sdk
dwave-ocean-sdk is an open-source quantum project.
MixedUnknownFlagshipQtangl relevant
open-quantum-safePost-quantum cryptography
liboqs
liboqs is an open-source quantum project.
MixedUnknownFlagship
quantumlibQuantum chemistry
OpenFermion
OpenFermion is an open-source quantum project.
MixedUnknownFlagship
entropicalabsOptimization and QUBO
openqaoa
openqaoa is an open-source quantum project.
MixedUnknownFlagshipQtangl relevant
Qtangl lens
Resources that matter most for a planning and optimization stack.
If you care about how quantum ideas intersect with scheduling, routing, allocation, and hybrid solver workflows, start with this subset first.
awsCloud and interoperability
amazon-braket-sdk-python
amazon-braket-sdk-python is an open-source quantum project.
MixedUnknownFlagshipQtangl relevant
dwavesystemsAnnealing and Ising
dimod
dimod is an open-source quantum project.
MixedUnknownFlagshipQtangl relevant
dwavesystemsAnnealing and Ising
dwave-ocean-sdk
dwave-ocean-sdk is an open-source quantum project.
MixedUnknownFlagshipQtangl relevant
cda-tumOptimization and QUBO
mqt-qmap
mqt-qmap is an open-source quantum project.
MixedUnknownFlagshipQtangl relevant
entropicalabsOptimization and QUBO
openqaoa
openqaoa is an open-source quantum project.
MixedUnknownFlagshipQtangl relevant
XanaduAIGeneral-purpose SDKs
pennylane
pennylane is an open-source quantum project.
MixedUnknownFlagshipQtangl relevant
Topic guides
Start with the question you are actually trying to answer.
Topic guides help people who do not yet know project names. They answer the broader question first, then route readers into the most relevant resources.
Guide
Quantum computing software in 2026: the open-source map
A guided overview of the open-source quantum software ecosystem by job-to-be-done, not just by project name.
Read guide
Guide
How to start writing quantum code: an honest path
A practical path from playful intuition-builders to serious frameworks, without pretending everyone should start in the same place.
Read guide
Guide
Quantum optimization libraries compared: QAOA, QUBO, and annealing
A practical comparison of open-source tools for modeling and testing combinatorial optimization workflows.
Read guide
Guide
Open-source quantum simulators: what each one is good at
A comparison guide for developers choosing between simulation styles, tradeoffs, and intended workloads.
Read guide
Guide
Quantum chemistry software for newcomers
A field guide to the chemistry-focused projects most often cited when people talk about practical quantum use cases.
Read guide
Guide
Post-quantum cryptography libraries you can use today
A practical overview of open-source PQC libraries and why they belong in the broader quantum software conversation.
Read guide
Full catalog
Search 157 resources without losing context.
The catalog stays readable even when you are scanning dozens of entries. Filter by category, language, or focus area, then open a resource page for a clearer explanation of what it is and why it matters.