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Copyfree Works

The license status of some works may be more complex than it at first appears here. In some cases, the license status listed for a given work is the "primary" license under which it is distributed. In several cases, parts of the work may be distributed under other licenses -- potentially even non-copyfree licenses.

Where present, descriptions are typically drawn from the claims of the projects themselves, and represent neither claims nor opinions of the Copyfree Initiative. Inclusion here (with or without description) does not constitute, and should not be inferred as, endorsement of any project.

Listings are presented for informational purposes only, and no representation is made as to the accuracy or utility of any information provided. Use at your own risk.

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axTLSpermalink

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Bitcoin-Qtpermalink

License Reference

Bitcoin is an innovative payment network and a new kind of money, and this is a GUI Bitcoin wallet application.

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Bitcoindpermalink

License Reference

This project provides the reference implementation for a Bitcoin library, daemon, and command-line wallet.

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btcdpermalink

License Reference

As an alternative full-node implementation of the bitcoin protocol written in Go, btcd provides an alternative to bitcoind that can substantially improve the diversity and resilience of the bitcoin ecosystem and infrastructure.

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calccrypto/OpenPGPpermalink

License Reference

This calccrypto implementation of OpenPGP is a toy/educational implementation of the RFC 4880 standard.

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Coinpunkpermalink

License Reference

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Demoncryptpermalink

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Demoncrypt is a lightweight C++ wrapper around some of the more common crypto routines in Crypto++. It is the open source crypto layer used in the closed source demonsaw privacy tool.

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ethereum-rubypermalink

License Reference

The ethereum-ruby project provides a simple Ruby library for Ethereum, and exposes deployed contracts as Ruby classes. It depends on a running Ethereum node with IPC support.

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EthereumHpermalink

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EthereumH is a tool written in Haskell to allow you to connect to the Ethereum blockchain.

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EthereumJpermalink

License Reference

EthereumJ is a pure-Java implementation of the Ethereum protocol.

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I2Ppermalink

License Reference

The I2P network provides strong privacy protections for communication over the Internet. Many activities that would risk your privacy on the public Internet can be conducted anonymously inside I2P.

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Several noncritical components (I2Psnark, Susidns, and Susmail) are strictly GPLed, and they are bundled with the default install package. The rest of the standard I2P system uses a tangled web of alternate licenses, where the options are such that all those components can be accepted under copyfree terms.

i2pdpermalink

License Reference

I2P (Invisible Internet Protocol) is a universal anonymous network layer, and i2pd (I2P Daemon) is a full-featured C++ I2P client implementation. All communications over I2P are anonymous and end-to-end encrypted; participants don't reveal their real IP addresses.

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keybase clientpermalink

License Reference

This is the keybase client repository. It includes the Go library and command line client, the Keybase service code, and clients for Android, iOS, Linux, MacOS, and MS Windows. It also contains packaged versions of clients for various OSes.

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keybase libwebpermalink

License Reference

This is a library for building web clients for keybase.

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LibHydrogenpermalink

License Reference

LibHydrogen is a lightweight, secure, easy-to-use crypto library for constrained environments.

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libsodiumpermalink

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libtomcryptpermalink

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LibTomCrypt is a fairly comprehensive, modular and portable cryptographic toolkit that provides developers with a vast array of well known published block ciphers, one-way hash functions, chaining modes, pseudo-random number generators, public key cryptography and a plethora of other routines.

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Litecoinpermalink

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Mechiel Lukkien's DESpermalink

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Mechiel Lukkien's SHA2permalink

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NaClpermalink

License Reference

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Nethereumpermalink

License Reference

Nethereum is a .NET integration library for Ethereum, allowing you to interact with Ethereum clients like eth, geth, or parity using RPC.

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netpgppermalink

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OpenPGP SDKpermalink

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OpenSSHpermalink

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pgpdsapermalink

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pyethapppermalink

License Reference

Based on the pyethereum library, pyethapp is the python based client implementing the Ethereum cryptoeconomic state machine.

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pyethereumpermalink

License Reference

The pyethereum project provides a Python core library for Ethereum.

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RbNaClpermalink

License Reference

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Slow KDFpermalink

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Slow KDF provides serious key stretching based on Scrypt. This addresses the fact that popular cryptographic tools have laughable key stretching functionality.

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Tom Zerucha's OpenPGPpermalink

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Torpermalink

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World Citizenshippermalink

License Reference

The World Citizenship project offers tools for managing globally orientated citizenship with private passport services using available cryptographic tools.

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