# GreenCity Simulation Library > Simulation library for distributed energy systems The linked Markdown files contain the published page content of this website. ## Key Pages - [GreenCity Simulation Library](/index.md): Simulation library for distributed energy systems - [Example Solutions](/solutions/index.md): GreenCity examples - [Workshops](/workshops/index.md): GreenCity workshops - [Extensions](/extensions/index.md): GreenCity extensions - [Virtual Testing for Energy Systems](/virtual-test-bench/index.md): GreenCity controller tests - [Let’s Talk About Your Project](/contact/index.md): Whether you want to simulate an energy system, improve its operation, or find the right software library — tell us what you have in mind. ## Further Resources - [Documentation](https://documentation.green-city-library.de/dir-greencitylibrary.html) ## Optional - [Frequently Asked Questions](/faq/index.md): Frequently asked questions about GreenCity - [Language Note](/gender-notice/index.md): Language note of EA Systems Dresden GmbH - [Imprint](/imprint/index.md): EA Systems Dresden GmbH - [Licenses](/licenses/index.md): EA Systems Dresden GmbH - [Privacy Policy](/privacy-policy/index.md): EA Systems Dresden GmbH - [Our Reseller](/reseller/index.md): Local GreenCity reseller contacts - [Cogeneration Sizing for Economic Success](/solutions/cogeneration-sizing/index.md): GreenCity example: cogeneration sizing - [Optimizing Geothermal Probe Field Size for a Cold District Heating Network](/solutions/geothermal-probe-field/index.md): GreenCity example: geothermal probe field sizing - [Testing PLC Logic Using a Digital Twin](/solutions/plc-logic-testing/index.md): GreenCity example: PLC logic testing