> For the complete documentation index, see [llms.txt](https://legacy-docs.aragon.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://legacy-docs.aragon.org/developers/tools/aragonos/smart-contract-references/common.md).

# COMMON

- [Autopetrified](https://legacy-docs.aragon.org/developers/tools/aragonos/smart-contract-references/common/autopetrified.md)
- [ConversionHelpers](https://legacy-docs.aragon.org/developers/tools/aragonos/smart-contract-references/common/conversionhelpers.md)
- [DelegateProxy](https://legacy-docs.aragon.org/developers/tools/aragonos/smart-contract-references/common/delegateproxy.md)
- [DepositableDelegateProxy](https://legacy-docs.aragon.org/developers/tools/aragonos/smart-contract-references/common/depositabledelegateproxy.md)
- [DepositableStorage](https://legacy-docs.aragon.org/developers/tools/aragonos/smart-contract-references/common/depositablestorage.md)
- [EtherTokenConstant](https://legacy-docs.aragon.org/developers/tools/aragonos/smart-contract-references/common/ethertokenconstant.md)
- [IForwarder](https://legacy-docs.aragon.org/developers/tools/aragonos/smart-contract-references/common/iforwarder.md)
- [IForwarderFee](https://legacy-docs.aragon.org/developers/tools/aragonos/smart-contract-references/common/iforwarderfee.md)
- [IVaultRecoverable](https://legacy-docs.aragon.org/developers/tools/aragonos/smart-contract-references/common/ivaultrecoverable.md)
- [Initializable](https://legacy-docs.aragon.org/developers/tools/aragonos/smart-contract-references/common/initializable.md)
- [IsContract](https://legacy-docs.aragon.org/developers/tools/aragonos/smart-contract-references/common/iscontract.md)
- [Petrifiable](https://legacy-docs.aragon.org/developers/tools/aragonos/smart-contract-references/common/petrifiable.md)
- [ReentrancyGuard](https://legacy-docs.aragon.org/developers/tools/aragonos/smart-contract-references/common/reentrancyguard.md)
- [SafeERC20](https://legacy-docs.aragon.org/developers/tools/aragonos/smart-contract-references/common/safeerc20.md)
- [TimeHelpers](https://legacy-docs.aragon.org/developers/tools/aragonos/smart-contract-references/common/timehelpers.md)
- [Uint256Helpers](https://legacy-docs.aragon.org/developers/tools/aragonos/smart-contract-references/common/uint256helpers.md)
- [UnstructuredStorage](https://legacy-docs.aragon.org/developers/tools/aragonos/smart-contract-references/common/unstructuredstorage.md)
- [VaultRecoverable](https://legacy-docs.aragon.org/developers/tools/aragonos/smart-contract-references/common/vaultrecoverable.md)