Cardano is described as 'decentralised public blockchain and cryptocurrency project and is fully open source. Cardano is developing a smart contract platform which seeks to deliver more advanced features than any protocol previously developed' and is an website in the Bitcoin & Cryptocurrency category. There are more than 50 alternatives to Cardano, not only websites but also apps for a variety of platforms, including Windows, Linux, Mac and Android. The best alternative is Bitcoin, which is both free and Open Source. Other great sites and apps similar to Cardano are Monero (Free, Open Source), Ethereum (Free, Open Source), Litecoin (Free, Open Source) and NameCoin (Free, Open Source).
Geconomicus is a generic free economic game under GPLv3, that includes a set of free graphics, files and rules allowing to play a generic economy simulation based on 80 years human life expectancy or more, with different money systems. Common open source code :...
Idena is a novel way to formalise people on the blockchain without personally identifiable information. Idena proves the humanness and uniqueness of its participants by running an AI-resistant test at the same time for everyone around the globe.